Brats came with EA71's or EA81's, neither of which had timing belts. The camshaft was directly driven by the crank, and actuated the valves with pushrods. That right there makes things much easier.
Another thing I can say from working on the XT: timing belt tensioners on EA82's are a breeze. They're spring-loaded, not hydraulic. You can release and reapply tension to the belt in 30 seconds flat, no removal necessary.
But the fact that the pushrod engines were carb and EJ's are FI, makes things easier right there. IMO, FI=good, carb=bad

Plus, EA82 heads are a mess compared to EJ's, they're in two pieces: the cam retainer and the actual head with valves in it. Also, Brat mentioned how easy the EGR system was. Well, we don't have em at all
It's mostly based on preference though. Usually whatever someone started working on
first is what they think is the easiest. I still feel that BC/BF's are easier than 80's Scoobs.