O.O vs Aria vs IGAB vs Next Level. Best "mashup" type of song?

I really like IGAB and NL is okay, i don't think Aria fits this category as it sounds like any other song for me and OO well no comment.

IGAB

I Got A Boy >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Aria>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Next Level>>>>> O.O

Next Level and O.O are both some of the worst Kpop songs of all time