Agreed with the others. No point wasting time playing DA here. Vegeta wasn't doing damage despite trying his damndest, despite a pseudo-Big Bang Attack hitting head-on, despite being on a mission to prove he was the Karate Kid. He had no chance, regardless of stamina issues.
Trunks, on the other hand, said he could do fairly well against both androids simultaneously. By logic, he would do even better against a single android. Thus, by even heartier logic, the gap between he and Future #18 factually cannot be larger than the gap between Vegeta and Presentable #18.