It seems I really need to spoon-fed everything to you but anyways, I will try to summarise you everything in this single post. If you still don't learn, then I will suggest you to not quote me with your nonsensical stuffs again.
To begin with, the thread is about IPL which is not an ICC tournament. The administrators are BCCI and a google search would give you this answer before you try to bring an ICC tournament argument in an IPL thread.
Secondly, below is the record of the two men who were in question in ICC World tournaments, i.e. WT20 and ODI World Cup:-
ODI World Cup:-
de Villiers- Runs 1207, Avg 65, S/R 117
Bumrah- Wickets 18, Avg 20, Econ 4.42
T20 World Cup:-
de Villiers- Avg 30, S/R 144
Bumrah played his only WT20 tournament in 2016 which was long back and it was during the start of his career. The next two WT20s will define his overall performance in that format.
Now, based on these stats, what it suggests me that these two have got probably one of the best Average/SR and Average/Economy combo you can ask from any player in ICC World tournaments. So, next time onwards, I suggest you watch some cricket before coming up with your illogical and brainless arguments in any discussion.
Now, I hope you understand that no ICC tournament is bigger than ODI world Cup or T20 World Cup so you don't bring some other lower known ICC tournaments in consideration.