I wouldn't say that many start with much of a puddle top, and the VIP can even have the mildest of domes.
The BT Soft can have a very slight puddle top, and will eventually clover some that it will have spots where a puddle top happens.
The only Harps I've seen with a true puddle top are the Mega Soft, and those are now OOP.
I think as far as stability goes, the VIP and BT Soft are most OS, TP next and then BT Medium and Hard.
The Soft gets warped and will look like an old boot fairly quickly, but I've had the same two since the first run and they don't fly any different.
Med and Hard scuff badly but don't warp as much, but as they beat in they can develop some mild turn and lose some fade.
TP and VIP look the same virtually forever, but can beat in to essentially be a no turn and mild ish fade disc. A lot like an Envy after a while, though maybe a Tick more LSS.
All the flavors of Harps are great. My only regret for them is that we didn't get an Elasto run before that plastic got killed.