@DBZ_universe: GT 17 has the same power as standard 17 being as he is a cyborg he cannot get stronger or weaker. Super 17 is bullshit because two 17's weaker than a ASSJ fuse to be stronger than a SSJ3 WTF.
If they fuse they romp it if not I think 17 would probably have the edge. He was stronger than Vegeta and future Trunks before they ascended and Goten and Trunks are just regular SSJ1's with far less battle experience than Vegeta/FT.
If the boys fuse they win. Pre RoSaT loses. Post RoSaT could win. Morals on for 17 make it easy for the boys to suprise him since 17 is your typical villian and underestimates and plays with his opponents.
Purely based off of the TV shows, I think those two can win. I think their combined strength, especially in SSJ is far higher than Piccolo's when he fought 17 and Piccolo was able to match him blow for blow.