I would be for SS 4.1. It has it's quirks and the same hardcore issue of the TW Game.

However, I do like the bundle of mods, the map size more states and cities, the titles that can only enhance the RP of the game, use UAI 1.5 for Campaign game and fixes to the ancillaries similar to FH's mod for KotR.

The draw back will be no further enhancement because of Kingdoms but maybe that is were FH can help out if needed.