I don't know about anyone else, I will surely take Bumrah over Wasim in world XI.
I mean all this longevity, swing , seam, magic is fine -- End of the day you got to pick 20 wickets cheaply and if you can do that in tough tours often then you are more useful for your team. I am assumng that world XI will not play some weak team and Wasim has just 1 5-fers in win in Aus, SA, WI, Eng, Ind in such a long career despite playing with a good test team. Bumrah has a far better home , away , avg, SR and impact. If people are waiting for 100 cheap more wickets to include such a high impact bowler in world XI then that's a wrong way to go.
As a career, I will wait a bit more to put Bumrah over Wasim despite Bumrah being better in home, away, avg, SR, impact. Right now, the gap is marginal in my mind and that's only due to longevity of Wasim. Before this series, I had said that if Bumrah takes 2 more 5-fers in win in tough tours he goes ahead of Wasim for me. He already has one in ongoing series where he won a test on his own. One more 5-fer in win by Bumrah in tough tour or 50 more high quality wickets, I will rate him ahead without hesitation.
For any pacer, high impact in tough tours with 250 wickets is far better than longevity of 500 wickets with low impact in tough tours. Pacers win matches in tests by picking 20 wickets cheaply or by blowing out top order. Bumrah blows out top order way more than Wasim. Over all it's marginal at this moment.
But for world XI,
200 test wickets, with such a huge impact. Give me Bumrah along side other impactful bowlers like Marshall, McGrath, Hadlee, Steyn etc.. who have many match changing 5-fers in tough tours. Not necessarily I will pick Bumrah in all time XI right now, but surely over Wasim for one of the spots there.