Never shot the 3pc but had a 1pc LB and still have several recurves. My understanding is the 1pc and 3pc LB's have a similar limb design.
The 1pc LB was very quiet and shock free. The recurve is also very quiet and shock free but had a different feel/sound than the LB. Not better or worse, just different. Obviously the mass weight of the recurve makes it a touch more stable, at least for me it does.
If the LB was a few inches longer I would've kept it for sure. Just a phenominal shooter. The bow would always get complimented (as does the curve), especially for it's silence