as someone who's been at both (albeit for a short time so far), i can tell you that both are good unis but are starkly different to one another. it really depends on the student experience you're looking for.
both are similarly well-regarded in terms of league tables and graduate prospects. ntu is very highly rated for employability, whilst kent ranks higher in academic prestige. i'd imagine the course at ntu would have more practical application, whilst kent would have more academic progression and involvement.
in terms of the university life itself, ntu is very much regarded as a 'party' university, and from my time there i can affirm that it does live up to the stereotype. the nightlife is phenomenal, but it is a huge part of the uni culture, so while there are obvious sober events to attend you'll probably struggle to find your crowd if you're not a clubber. ntu is also located directly in the city centre of quite a popular uk city, so your daily environment will be quite loud, buzzing, and fulfilling (though potentially overwhelming if you're not used to cities, there's always some form of noise going on). kent, however, is a quaint, green campus with MUCH less drinking/clubbing culture. i moved from ntu to kent and was shocked at how different the two are. i'd say it's very 50/50 at kent with drinkers & non-drinkers, and there is definitely much more of an academic focus than at ntu. around 70% of people i've met at kent have been quite introverted, however at ntu everyone seemed very extroverted and eager to go out daily. again, whether this is good or bad depends entirely on your preference. the city of canterbury is pretty and has a historical vibe, but not much going on in the way of nightlife, and definitely not as much of a proper bustling city vibe as nottingham. excellent for people who prefer a quieter lifestyle, but perhaps a bit stifling if you don't. it does definitely carry a 'boarding school without the rules' feel, whilst nottingham feels a lot freer.
honestly, as i've said about 100 times now, it really just depends on your preferences. as you identified, both have good business schools, but both excel in different ways. both have decent student life, but two starkly different experiences.
let me know which you choose! hope this was helpful and all goes well for you.