Fee reductions are usually worthless as (especially if you're a more mature student) you are unlikely to ever pay off the full amount earlier. Having the money up front is much, much, much more useful. The NUS and the money saving martin website guy have written loads about this. The only 'person' fee small (£1000-£3000) fee waivers benefit is the treasury.
Kent are offering:
A fee waiver of £4,000 for the first year (ie the first year’s tuition fees reduced to £5,000)
A cash bursary of £1,000 for the first year
A further cash bursary of £2,000 in each of the years 2 and 3 (and 4 where relevant)
Which, for a 3 year course, is a cash bursary of £5000 and a fee waiver which will reduce your tuition fee debt from £27000 to £23000. The fee waiver isn't 'real money' at all.
Durham are offering £3000 cash/accommodation discount a year, so that's a total of £9000.
So they are both technically offering £9000 off your costs, but Durham is offering you cash which you definitely receive, whereas you won't know if you'll ever get to repaying your 24th thousand pounds of fees until years in the future. Durham's is a much better deal (assuming you get cash instead of an accommodation discount).
Exeter are even worse - a £2000 fee waiver each year and £1000 as an accommodation bursary, OR a £3000 waiver each year.
So your fees would be £6000 instead of £9000 (assuming you don't want accommodation). Again, most 18 year old entrants are unlikely to repay more than £18000 of fees so this is again not 'real money' at all.
http://www.nus.org.uk/en/news/news/nus-calls-on-nick-clegg-to-explain-daylight-robbery-as-70m-is-taken-from-students-pockets-to-pay-for-con-trick-fee-waivers-/http://www.nusconnect.org.uk/news/article/come-clean/Bursaries-and-fee-waivers-the-facts/