If you are talking about physical strength then strongest version of thanos is year 20xx when he actually wiped out half population just to prove his love towards death and stronger version of joker is emperor joker who is omnipotent and omniscience and has all powers of gods like super strength and durability and many more. Now the catch is that he could reverse the effect of his opponents. So, he could reverse the effect of gauntlet(if it took place in marvel universe as gauntlet cannot work in dc universe). Its very hard to determine who would win. Let's leave that on authors.
If considering the impact and fan following then definitely joker wins because he has got a lot of exposure compared to thanos and all thanks to Nolan's masterpiece.
Originally posted by juggernaut74No, he will not. Joker has been done twice over so since then. You have to ask which joker since there are so many. Only one Thanos, friend. No one will ever forget the ending to the IW and EG. Way more successful and memorable than the Dark Knight.
Joker all day.Thanos will be forgotten in 10 years.