People book TK business class because they are usually cheaper than competitors on the same route. So you just need to weigh the pros and cons, and decide if it's worth the risk of airplane swap, for the cheaper price.
Personally, as a solo traveler, I'd rather have a direct isle access window seat. So, TK's A350 or 787 works for me, but not 777.
SQ is the best if you don't mind paying much more.