I think both are roughly the same if you plan to use Ori parts...if u r going for aftermarket parts then is different case la....depends on what u buy.
Best of all, is how you drive the car and how you maintain it. With good care and maintenance any cars will be hassle free. Toyota cars which I'm also referring to these two cars, they are reliable.
MRS, there are 2 types, One hard-top and the other is soft-top convertible...but maintenance wise since is convertible, I guess Celica would be a better choice..but FC will be slightly higher due to more powerful engine. Still is only 1.8cc la....
So, overall I would say both cars FC and maintenance would be roughly the same...just personally by my own judgement. Never tested both cars before...but Altis engine which is also in MRS, the FC is real good and I have an Altis at home.
MRS = 2 seater, MR car
Celica = 5 seater, FF car