Are the soundpacks from FTSIM+ better than FSS or PNDG?
Definitely better than PMDG, but I wouldn’t spend money when there’s an excellent freeware one on flightsim.to for the 737s: https://flightsim.to/file/77459/pmdg-737-sound-pack
As far as the FSS regional jets, I don’t have the FtSim sound pack so I can’t compare the two, but I’m pretty sure its close.
I think FTSim’s packs are always better. Sub for $5 and download everything you think you might want. If you choose, you can then cancel the sub and keep what you’ve downloaded.
I’ve tried both FTSim (latest version) and the excellent Flightsim sound pack, but for the life of me I still can’t decide which is best. I don’t really care about pax cabin sounds or external sounds, only how it sounds in the flight deck.
I tend to like the Flightsim free version a little better but not 100% sure.
Would you also recommend for fenix?
No, in my opinion the Fenix sounds are way better than any FtSim sounds I do have (like for the FSS E-Jets, PMDG). I don’t own FtSim for the Fenix so I can’t draw a comparison, but unless they completely upped their work I wouldn’t expect any better.