Currently Darkseid is stronger than Superman who's a world bencher. Helspont and Darkseid are the 2 physically strongest characters in comics
Assuming this is Post Crisis Pre FP
Strength
Stronger Probably about the same, maybe slight edge to Darkseid
Faster Probably the same
More durable Thanos, even though Darkseid while weakened took a hit from a piss off Supergirl, from numerous top tiers, the characters that Thanos survives against are a bit more powerful
A better fighter If they fought I don't think the outcome would come to fighting skill
Best striking power Physically probably about the same, Darkseid's energy attacks are a bit more powerful though since he's 2 shotted Henshaw when he was using the Apokaliptan Soldier Corpse, which can survive a black hole, he's also one shotted Orion, Superman and Agogg
More Versatile
Telepathy: Thanos. I haven't seen Darkseid use telepathy more than communicating with people. It was stated that Darkseids telepathy is greater than Sleeze,. a guy who mind controlled Barda and Supes are the same time. But it's hearsay and feats weigh more
Matter and energy manipulation: Darkseid in this case, especially in matter manipulation via OE
Time travel/teleportation. From what I understand both can teleport at will but I've only seen Darkseid be able to time travel without tech and even toss people through the time stream.
Best power output showing
Same, both have high and low showings
Smartest
Scientifically maybe a slight edge to Thanos, Darkseid's shown to be a better manipulator though. Overall the same