What are the current recommended Autosave tools - I know FSUIPC has an option but is there anything else that is worth considering ?
Mostly using pmdg 738 these days.

 

As far I am aware apart of FSUIPC you can also use Volanta which has autosave function

Whilst there is no autosave in msfs, I do recall it being as a source of stutters in fsx so it's a mixed blessing really.

I tried using FSUIPC's autosave but it caused a stutter for me.

This was a few months ago.  Also, I still have MSFS installed on a "regular" SSD (not on one of my M.2 drives).  Still it's a Samsung SSD and of decent speed, but that SSD was supposed to be a storage drive -- it never really was intended for a flight sim install.

I never dug into it too much, it's possible I could have loaded FSUIPC onto a specific core (using a batch file with a core mask on the exec line) and it would have avoided the stutter, but I've never tried that.

I just got VOLANTA premium yesterday for this exast same reason. Works like a charm. Chewwy actually has a video where he CTD on short final on the 737, he then demonstrated recovering the flight.

I use FSUIPC and it works wonderfully.  That said, for the PMDG 738, since the program automatically saves the panel state when you do a save game, game saving takes about 15 seconds whether FSUIPC does it or you do it manually in MSFS.  So, expect a temporary freeze-up (I wouldn't call it a stutter).  This is why I set FSUIPC at 20 minute saving intervals.