Combos are actually the easiest execution part of Tekken. It’s moving that is hard. SC is the easier one, and well it’s an imbalanced mess in S2 (then again SC is usually an imbalanced mess, late S1 was an exception)
FS uses GGPO, so 5/5 netcode. Problem is, playerbase is about 5. The only GGPO game with a great playerbase on all platforms is MK. KI has a decent-sized one, though XB1-centric (Steam crossplay is only for non-ranked). SG/TFH will temporarily have a few players due to EVO.