first of all Welcome!
all modlist are stable but sober, fifi's and the Wolves of steel mega mod are with TDW's UI
My mod list and Wolfes from the deep mega mod is with MagUI.
now about each UI TDW's UI is the most used UI in SH5 cos 99% of the mods are compatible with TDW's UI to be honest i think is the best UI....and is a bit CPU heavy
MagUI is an old stile interface less CPU heavy but u don't have atm real navigation and other nice stuffs wich one have TDW's UI...
u can try each of them play some mission and then u will see wich one u like ...
PS. do not forgot to read
http://www.subsim.com/radioroom/showthread.php?t=190656
http://www.subsim.com/radioroom/showthread.php?t=205620
http://www.subsim.com/radioroom/showthread.php?t=211804