I've never used a pellet grill, but had a friend who swore by his Traeger.
I use a Weber Genesis gas grill for nearly all my grilling. It's big enough and hot enough for most anything . I've had it for four years and it's in great shape ( I used to burn up cheaper gas grills every 18-24 months). For high heat cooking and blackening, I keep a Weber kettle grill on the deck.
I've got two friends who swear by the Big Green Egg and that looks like a good way to go, although expensive.
I've got too much outdoor cooking stuff now and I'd probably have to move out to the deck if I bought more:
(Weber gasser, Weber kettle, Weber Smokey Mountain smoker, extra large electric cabinet smoker, Charbroil Big Easy IR cooker, campfire cook set, etc.
(Designated as ne'er do well)
"we deal in lead, friend"
Whiskey River take my mind