Welcome
That is not an easy question. If you don't have SH3, get it and also the GWX mod. There is still lots of play in SH3
I am playing SH4 as well now, like the game a lot, yes it is buggy, but I am being optimistic and thinking there are more fixes on the way. Plus there are some great mods for it already. The game has
great potential.
In the end it is a matter of opinion though, you will find here at subsim everybody's got one, good, bad and yes ugly
RDP