Crakatak187 said:
Hard to tell how much stronger since both got clobbered by Gotanks Super Buu.
It'd be fair to say it was a considerable amount. Gohan was smacking Super Buu, whom Goku was sure he himself wouldn't stand a chance against, all over the place until he absorbed Gotenks.
Ten years is a long time, but it's not like Goku was doing any particularly strenuous training. All their big strength boosts come from training in places like the afterlife, gravity chambers, or the Room of Spirit and Time. After Buu, Goku's pretty much just keeping himself fit out in the woods without anything or anyone to really push against. It'd come down more to how much Gohan deteriorated over the decade, I think, and a lot of that's down to technique more than strength.
With the fight against Dabura, I don't think he'd
lost a lot of power so much as he was unable to tap into his anger and draw strength from it (the comparison we're given is when he fought Cell, and he had a serious rage boost at that time and was at his peak in terms of fighting skill, having just spent four years training with Goku and Piccolo), combined with his sloppy technique (not exactly gonna be up to par when your only training partners after seven years of slacking are a regular human (who you're also spending time teaching to fly) and a six year old).
It could go either way depending on how you want to look at things, really.