Vegeta wins unless he gets cocky and toys with cell to the point where he can get enough zenkais to vegeta's level. I'd say vegeta takes the majority. Simply because 18 is fodder, and sure, 17 is on his level(he tanked an attack ment for ssjbe vegeta), but vegeta has the raw power advantage.
Current 18 is fodder, and Cell's level was also fodder to Super Vegeta so this is basically amped 17 vs Current Vegeta.
Honestly, I'd say this Cell. 17's barriers took blasts from Jiren and Cell has to be annihilated to the last cell to be killed. That and his infinite energy basically make this a game of attrition which this Cell wins.
There is also the fact that he can just blow himself up and destroy the planet, killing Vegeta as he can't breathe in space