The difference between sample based and physical modeling is what is meant by playability in at least one sense. That is to say sample based pianos tend to have an uneven response to velocity articulations. Just not smooth with the control of a real piano. Pianists will agree that the depth of expression of a fine Steinway for instance that has been well maintained is beyond the reach of emulations. This is ever so evident in sampled pianos and it takes away from the subtlety.

Of course, if you are banging out chords with a rock band it won't much matter. However, if you are playing with one or two other acoustic instruments or solo or with just a singer, it WILL matter.

Enter physical modeling. I have tried the V piano. In regards to smooth velocity sensing, it is very good. Not, of course, as good as the real thing, but not as expensive and difficult to maintain.

I have heard pianoteq on their website. Sounds pretty good. I intend to demo it and see if it solves the problem. I have a Yamaha CP33 and a NORD Stage EX. Both of these are very good though software and physical modeling have caught up and are running with the ball at this point.

As stated above, it does seem like modeling will be the ultimate winner in the race to second best.