It must be so hard, as an international applicant, to decide when you can't spend time in each of your options! I don't know much - anything really - about Kent but have made Aberdeen my firm (unconditional) choice so I can tell you specifically what I like about Aberdeen & perhaps give you a few general points to consider too...
From the very outset, before even applying, Aberdeen's level & style of communication impressed me. When dealing with the university, I have always felt welcomed & valued, never just another applicant in the vast ocean of applicants. Aberdeen has really strong student support systems. All under-grad. lectures & tutorials at Aberdeen are taken by teaching staff, never by post-grad. students. The university is large enough to feel cosmopolitan & buzzy but small enough not to feel overwhelming...actually, that pretty well sums up the city of Aberdeen too.
If history is important to you, founded in 1495, Aberdeen is the 5th oldest university in the English speaking world. It is one of only 7 Ancient Universities.
If climate is important to you, be aware that Aberdeen has colder, harsher weather than Kent. I know this seems a silly point to some but I think it's important. The level of rainfall in Glasgow is one of the reasons I didn't apply to either Glasgow or Strathclyde. I don't much mind being cold but really hate being wet so would find spending 4 years in a damp, soggy climate depressing.
If time is important to you, the Llb in Aberdeen is a 4 year course & in Kent it's 3.
If league tables are important to you, a TSR poster complied a "table of tables" earlier this year. Aberdeen features & Kent does not.
I don't know if that's any help; I've tried to be as balanced as possible but have clear Aberdeen bias!