[tom the eldest]

I realizes that pj always put gandalf on bridge battle.here the list:

1.fotr(vs the balrog)
2.auj(vs great goblin)
3.dos(vs sauron)

Anyway,if gandalf are permitted to use his full power and fight sauron,idependon whatversion of sauron.remember,over the ages,sauron get weaker and weaker,after his first defeat,it took him quite sometime to regain his bodies,second time,it took him even longer,then when the fall of numenor,he cannot assume fair shape anymore.it just like morgoth,he pour so much of his essence to his minions,he gradually became weaker(with the fact that he get his body destroyed a lot of times).initially,morgoth were able to defeat every single valar until tulkas came single-handedly,but later,fingon managed to evade his blows and even wound him seven times.so,if its first age sauron,sauron wins,second age sauron maybe,in the third age,gandalf has a chance.