I use a Crossbow and can pull a regular bow back just fine. I personally use a crossbow for one reason and one reason only. To ethically kill my quarry. I believe to put down a Mature deer it takes a few factors but the main 2 in my eyes is accuracy and a complete pass through, both of which the crossbow excels at. I primarily hunt trophy whitetails and it would disturb me beyond compare if I would wound a giant and have him die and feed coyotes because I didn't use best possible method in harvesting him.
People who diss Crossbows then cannot support Compounds. People say Crossbows make it "Easy". Doesn't 80% let off make it easy? Doesn't a lighted pin compared to shooting instinctive make it easy? A Peep sight? A Stabilizer? String silencers? A mechanical release? Carbon Arrows? Lighted knocks? So dissing the mechanical advantages of the crossbow is silly when the mechanical advantages of the compound over the Recurve outweigh the advantages of the crossbow over the compound. Personally, I don't listen to what anyone says on how I hunt or what I hunt with. That's my choice and freedom.
To the original question. When I purchased my Crossbow last year I literally tested over 15 crossbows. Why the price differential??? Here is what I tended to find. Cheaper crossbows tend to have less of a warranty, sometimes less forward hand protection, squeaky moving parts, less speed, rails that may warp, limbs that may split. And the big thing I tended to find is that cheaper crossbows tend to have very POOR customer service in case something did go wrong! This is what I tended to find but there are exceptions to the rule. A cheaper one may suit you just fine.
More expensive crossbows can still have the same issues but the odds are greatly reduced. Warranty's are usually longer and the crossbow itself just feels better built. Shoot enough of them and you will know what I mean. Don't get me wrong, even the most expensive crossbow that I tested was the Scorpyd ($1800.00). Super fast, Smooth and well balanced. HOWEVER, I could not flip the safety over with out it making a click. I must of tried at least 20 times go slow or pinching and sliding that safety and it would still make a distinctive click. That was a deal breaker for me. Maybe it's changed for this year.
Ultimately, I purchased the Horton Storm because it felt well balanced, fast and smooth. The overall balance and feel was my deciding factor. And because it was a subsidiary company of Tenpoint it was a little less in price but had the same Tenpoint build and customer service.
So shoot em all, set a budget, practice, and most important be in the woods.