whilst the thanoscopter was funny, i think he's more well known for becoming the god of the universe and killing all the avengers, plus spider-man and pretty much every other a-lister?
my point is, up until final crisis, and seven soldiers too i guess, darkseid became a laughing stock. a pale shadow of his former self. this is undeniable. i mean, i didn't just pull the name "jobberseid" out of no where and i'm definitely not making up the part where he fell down some steps like a chump. in recent years, as in, the last 5 or 6, dc has been trying to rehabilitate his standing in the comics, to varying degrees of success, jla not being one of them. whilst thanos has been successful and not a laughing stock ever since infinity gauntlet which was like, 15 years ago.
true darkseid has been awesome in the cartoons, thanks to ironside. but who watches those cartoons? about 100,000 people. so this idea that darkseid is more prevalent in pop culture is also laughable.
in summary, i think it will be awesome to see both darkseid and thanos on the big screen. they are both great, and very, very different villains, despite their superficial similarities.