agog4games: First one then the other, starting with D3 I must admit.
But soon it will simply get on your nerves with the constant grind and cartoonish style, then GD will offer a fresh new world and play style.
Seriously no idea what Avidma´s problem is?
I´m using all 9 hotkey slots constantly, mapped to my keypad and even have to jump to the 2nd one when my pets get fried.
Just because the leveling process is longer, doesn't mean that there is no grinding... You will get plenty in GD.
And you triggered me on artstyle. In D3 it's ok, goes fine with the gameplay. GD have a good design in few places, but overall, it feels very stiff, both in animations and gameplay. You may not agree on gameplay, but the animation? It's subpar, even if not comparing with D3. Graphics in GD are unclear and clustered with unnecessary objects that lower the already unclear game even further. Pots that are clickable with loot, pots that are just destroyable without reason and indestructible pots, because why not? I constantly had problems with telling if something was an enemy, a dead body or part of the ground... that's until I started one shotting crowds of enemies of course, then it stopped mattering.
D3 have the upper hand in that it's currently designed to focus on end game alone. Leveling process is nearly eliminated. D3 doesn't waste your time with running around places, looking for things. You hop into the game and do whatever you want. Both at end game and while leveling. It's all about experimenting with builds and having fun with them, gathering gear, progressing Greater Rifts (end game dungeons)... No time spent in the game will be wasted, even if you just played for like half an hour, because you were really bored.
Even if there is something specific you need, like crafting materials or leveling special gems, you still can reach it very quickly without trouble and while actually playing the game, that is killing monsters and these monsters are never a waste, as EVERYTHING in D3 have chance of dropping end game gear and other goodies.
D3 is clean and straight forward. Even completely new players to the series won't be lost (saw my unexperienced friends start D3 as their first h&s and they quickly grasped the basics). You always use almost 100% of the build, not holding back on anything. That's very good idea IMO, I don't like situational things and it doesn't really make the game more strategic, especially not with monsters as boring as in GD.
And you are describing a build that uses pets. That's almost always the most complicated build in any game that did pets properly, like actual followers. I like pet builds, mind you :) The more, the merrier.
That's a huge disparity BTW... Having an option of running a pet build with micromanagement or just holding one button and proccing everything else. Of course you may be just "playing wrongly", and by that I mean, playing not optimally. Not meaning it's not fun, just not like you would if optimization was your goal.
I would discourage someone from buying D3 over GD only if they weren't interested in end game. I remember when I played Diablo 2 and never reached the end game, just leveled one character after another. I am no longer interested in this kind of gameplay.