The only way that can be proven is to give both coaches both squads and see what they do.
Otherwise it's just opinion and educated guesswork.
My educated guess is Ange would drag Poch's team downwards and Poch would drag this team upwards.
Even if we win the Europa league this season, it doesn't mean we've achieved more, IMO. We have litterally sacrificed one competition for another. Exactly what Poch did in the days we were in the Europa league but vice versa.
If you are willing to accept poor league form domestically, getting to the Europa League final and potentially winning it is far easier than 4 top 4 finishes, including 2 title challenges.
I mean, it's what Poch did constantly. Even with the CL final run, our league form in the back end of that season was relegation worthy. 3 wins from the last 12 losing to Burnely, Southampton, West Ham etc.
I personally think a trophy is an achievement ans 90% of fana would aee it as so. You think Woolwich would rather their season or ours if we win Europa?
Ultimately we'd both start next year in CL, on 0 points but we have something at least to show for ours.