best ensuite accomodation in warwick?

They're all pretty decent and have their advantages and disadvantages, but no real major issues/differences aside from price, so I wouldn't stress about it too much! (Especially since you can only apply to 3 en suites and aren't guaranteed to get one). Some quick notes:

Heronbank: £180 a week, cheapest en suite, pretty location. A bit dated and only single beds, but still a nice place to live. Tends to be pretty quiet, but I find that to be ideal: I can easily socialise elsewhere on campus, and then come home for a bit of peace and quiet and alone time. Longer walk to Tesco but only 10 minutes from most other places on campus, so ignore anyone saying it's "miles away" Very convenient for Sports Hub.

Lakeside: £185 a week, similar location and information to Heronbank, just with 3/4 beds and more recently renovated. I found this to be a bit more sociable than Heronbank, but that may have just been because I was in a "party flat", it generally has the same quiet reputation as Heronbank.

Sherbourne: £193 a week, probably furthest away from central campus but still a nice location and not too far. Also convenient for Sports Hub. Kitchens are shared between more people than HB/LS (12 instead of 8), but they're also a bit bigger (and nicer in my opinion). Newer than HB/LS so a bit less worn down, but single beds so worse than LS in that regard if you prefer a bigger bed.

Jack Martin: £198 a week, central campus, 3/4 bed. Bit more party reputation than the lakeside area ones, but not as bad as Rootes so should still get some sleep. You have to move out for 5 weeks over Easter, which is a bit inconvenient but saves money on rent.

Arthur Vick: £221 a week, otherwise same info as Jack Martin. Price difference comes down to AV being more modern I think, no idea why it's such a big difference.

Cryfield Townhouses/Apartments: £207/£215 a week. 3/4 beds, modern accommodation, very convenient for central campus and sports pitches. It has its own little social area which is nice, and tends to be pretty popular among people who live there. Main issue I've heard is the noise carrying from both piazza events and sports matches, so can be a little loud at times.

Bluebell: £233 a week. 3/4 beds, modern, has a bit of a reputation for being isolated and only very rich/international students due to the price. I've never met anyone who lives there, so I can't say much, but I really don't think it is worth the ridiculous price.

In terms of your other options (non en-suites) look into Claycroft and Tocil, as you only share bathrooms with 1 and 3 other people (respectively).

They're all pretty decent and have their advantages and disadvantages, but no real major issues/differences aside from price, so I wouldn't stress about it too much! (Especially since you can only apply to 3 en suites and aren't guaranteed to get one). Some quick notes:

Heronbank: £180 a week, cheapest en suite, pretty location. A bit dated and only single beds, but still a nice place to live. Tends to be pretty quiet, but I find that to be ideal: I can easily socialise elsewhere on campus, and then come home for a bit of peace and quiet and alone time. Longer walk to Tesco but only 10 minutes from most other places on campus, so ignore anyone saying it's "miles away" Very convenient for Sports Hub.

Lakeside: £185 a week, similar location and information to Heronbank, just with 3/4 beds and more recently renovated. I found this to be a bit more sociable than Heronbank, but that may have just been because I was in a "party flat", it generally has the same quiet reputation as Heronbank.

Sherbourne: £193 a week, probably furthest away from central campus but still a nice location and not too far. Also convenient for Sports Hub. Kitchens are shared between more people than HB/LS (12 instead of 8), but they're also a bit bigger (and nicer in my opinion). Newer than HB/LS so a bit less worn down, but single beds so worse than LS in that regard if you prefer a bigger bed.

Jack Martin: £198 a week, central campus, 3/4 bed. Bit more party reputation than the lakeside area ones, but not as bad as Rootes so should still get some sleep. You have to move out for 5 weeks over Easter, which is a bit inconvenient but saves money on rent.

Arthur Vick: £221 a week, otherwise same info as Jack Martin. Price difference comes down to AV being more modern I think, no idea why it's such a big difference.

Cryfield Townhouses/Apartments: £207/£215 a week. 3/4 beds, modern accommodation, very convenient for central campus and sports pitches. It has its own little social area which is nice, and tends to be pretty popular among people who live there. Main issue I've heard is the noise carrying from both piazza events and sports matches, so can be a little loud at times.

Bluebell: £233 a week. 3/4 beds, modern, has a bit of a reputation for being isolated and only very rich/international students due to the price. I've never met anyone who lives there, so I can't say much, but I really don't think it is worth the ridiculous price.

In terms of your other options (non en-suites) look into Claycroft and Tocil, as you only share bathrooms with 1 and 3 other people (respectively).