As far as ease of bucket water changes, with the systems that i've used, i'd rank it 1) sump 2) canister 3) HOB
The sump is awesome... I just pull the overflow line, which is just laying in the bottom of the sump, and point it into the bucket for a minute, and that's 5g out. To put 5g back in, i just tip the bucket over into the sump (which is on the floor), and that's 5g in. No lifting, no sucking to create a siphon, no cloudy water, no ruined aquascape.
Either way, the only "difficulties" of changing water with the HOB is that you're lifting buckets up to dump them into the tank. I got lazy and spent $30 on a powerhead, so that i wouldn't have to rescape after dumping the water in, and so that i didn't have to lift the buckets to shoulder level, usually soaking my carpet.
In general, if you're choosing between HOB and Canister, i'd recommend canister due to the other positives already mentioned, but it is an added benefit that the water changes are slightly easier