I feel like the amount of stacks I get are insignificant. I've been playing 
and the suggested enchantment is devourer. I know to buy 
instead of 
. I average probably 40-50 at the end of a 35 minute game. Should i go cinderhulk or warrior instead?
You could go cinderhulk if you really need hp early... but you shouldnt. Devourer is a lot better on attack speed champions like Warwick, Shyvanna, and Master Yi. Especially if you are going to powerfarm, which is a very good strategy if you are an inexperienced jungler. And blue smite could actually be more useful since they nerfed the red one, since it would give you a slow for better ganks etc while your ult is on cd.
Honestly though, I wouldn't actually play warwick, as hard as he's been nerfed. I strongly recommend Yi or Shyvanna, as they farm jungle really fast and have outstanding late games. Yi can pretty much just right click to victory, so if you're a real baddie, you can probably still faceroll games with him if they go on long enough.
Devourer is only good on junglers that: a) scale very well of attack speed and ideally have abilities that proc on hit effects, b) that farm very efficiently. Personally I only use it on shyvana, though cinderhulk is also good on her. I wouldn't even build it on Master Yi, he is better off with warrior. Can be good on ww and udyr too. But again, not necessarily best.
If your going Bruiser on Warwick, Go CinderHulk and get a BotRK as your core damage item. BotRK with it's %HP damage will deal a lot more that Devourer will. All while CinderHulk gives your late game Tankyness. Splash cooldown, As your ult makes a decent initiation tool.
The only way to really make Devourer work is if you can our farm the enemy Jungler and bully them out of their own Jungle. (Which could be possible as warwick.) The Problem is that Riot does not support AFK Farming, and that's essentially what you have to do to stack Devourer.
Personally I've been doing a magic-damage build on Tryndamere using a Devourer/Wit's End combo that works surprisingly well over a long game, and allows him to fight in teamfights longer than he usually would consider with all the AS he gets. It also works nicely on Kayle jungle if you want to go that route, but she can build almost anything as far as I can tell.
That said, champions need to scale really well with attack speed and clear quickly to make good use of the buff. If you ever need to you can also try dragging games out if you're losing so you can get stacks. The large wolf, large raptor, Gromp, rift scuttler and dragon/Baron all give a stack (if you didn't already know), so you can farm like crazy with it and make it into a powerful damage item.
