Ymmv obviously but my 2c
TL/DR
I chose petrof and u4 for my non-free piano models and am happy with those.
I also have got a lot of use out of the electric tines/reeds pack - best value for me
Long version
I went for the Pro bundle. But this is a lot of money and I don’t think I would have done so had it not been classifiable as a work expense. That said, I think the extra engine features are really special - setting physical parameters per note can allow construction of wonderfully unique instruments.
Personally I would be unhappy with anything less than the Standard version, which unlocks tuning features - a huge benefit of digital instruments.
Maybe worth noting that I’m mostly not using this for traditional piano practice, I usually use the software with a linnstrument.
My fourth instrument pack selection was the Hohners, which maybe I regret a little.
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