How long is a piece of string?
Seriously I would have to say that although I build and buy mostly A/C I find them a little more difficult than armor. Like everyone has alluded to building A/C you have to be a little more careful with all the fiddly bits. i.e canopy, gear, various antennas. Armor for me has very tedious things like painting all the wheels and doing the tracks, but they tend to be much more forgiving to a little ham fisting.
I do think that getting the weathering right is a little tricky with armor as you walk a fine line between just right and ridiculous, and most armor project just don’t look right without any wreathing whereas you can get a way with an A/C with a factory finish.
Just my rambling thought on a question with no clear answer like the chicken and an egg dilemma.