I still keep a gasser with flavorizer bars in the arsenal, and had the lava rock version many moons ago. I don't recall a difference in taste, but the lava rocks were a long time ago. Gassers are a good all-purpose tool (and a great backup if you realize you're out of pellets...and your tank isn't empty). And for searing. Smoke can be added with a chunk of wood wrapped in foil, with some holes poked in it, tossed on the bars. As long as I have the space, I'll likely always have a couple different types of grills. And nothing against the Bullseye, there'd probably be one out back if I could have ordered one.
I'll be honest... I would love to keep an arsenal... but if I have to choose, Weber vs Teq... I'm keeping the bulls and adding there.... lol