You got into Warwick MORSE? Now that's crazy, well done. I don't know where to start. Firstly, I'd like to start with reputation. City has nowhere near a strong reputation as Warwick, and Bath comes after that. You have the whole argument where if you take an actuarial science degree, you'll be exempt from (x) amount of exams- but I don't see that as a reason to why you should even think about choosing Bath or City OVER Warwick- that's crazy! Firstly, once you complete a MORSE degree, those exams that the City and Bath students are exempt from, will be so easy for you- so you can just go ahead and do it as it will be far from hard. MORSE is such a hard degree- but Warwick has such a strong rep for it. I know only one person doing MORSE- she loves it because of how much tutorial time she gets, and the fact she is in love with statistics and maths, so every lecture she goes to, her mind is blown. Secondly, Warwick has such a prestigious rep compared to that of Bath and City. City is extremely overrated, extremely. It's like having the whole, do you need an accounting degree to be an accountant? Or can you be a mathematician and get the job in a much easier way. Having a MORSE degree will be a million times more impressive, and on top, you're getting it from one of the top institutions in the UK.
Warwick has extremely strong links. CASS has some, but they lie about a lot too. The City students that finish off the degree cannot compete against a Warwick maths student. They really can't. Their entry requirement is so ridiculous and embarrassing as they are trying their hardest to become a RG, but a far for good enough. They love clearing so much, so even if you get BCC, and didn't even accept their offer, you will still get into Actuarial Science. They are one of the most extremely called up unis in the UK during clearing as their grades drop so drastically. Embarrassing. With a Warwick degree, you'll become an actuary in seconds- much faster than a city student. Furthermore, if you decided after a few years you wanted to do something else, you have gold in your hand with that degree.
Warwick has strong tutorial systems, so you get a lot of help in extremely small sizes. In terms of social life, it has the largest number of proper socs. It has a great campus, only thing is, CASS is in London. But be careful when trying to compare a CASS degree to a Warwick degree, that's nearly an insult. To be quite honest, Warwick can only be compared with LSE, UCL, Imperial, Durham, Bristol, KCL and Eburgh (maybe St Ands), the rest, no way.
Well done to you for actually getting onto MORSE because, boy, that is far from easy.
If I were you, I'd firm Warwick and insure Bath. You want pride in the reputation of the degree. Good luck!