RGV PVs need regular love and attention otherwise their centre pin gets misbehaves and drops onto the cylinder. The NSR equivalent is blowing the PGM as the RC valve refuses to move because it gets clogged up with unburnt oil and residue.
Both bikes are good, both will get you 60hp without a problem, the most important thing would be to get the suspension setup properly since they are almost 20yo, and then slowly start chasing the hp
