Quality of parts is usually the price difference. Some people rate outbacks but they’re well known for rusting quickly, I’ve got one for convenience and had to replace the burner twice in 4 years due to corrosion. But the parts aren’t that expensive. We have it for convenience if we want something doing quickly as we already have the gas for our pizza oven.
weber are seen as good but aren’t as good as they used to be but will certainly outlast the cheapo ones
kamado (big green egg, kamado jo, the lidl special buys Etc) is the way to go but they aren’t cheap and you need to be “into” it to be pending that sort of money
I don’t think it’s petty calling them outdoor gas grills personally, I don’t bother to correct people myself but what the majority of brits do with a “bbq” is grilling, it’s just become the accepted phrase though but if you saw someone talking about a rugby game and they were calling it football you’d probably call it out, they’re both sports but very different.
Bbq is a much lower temperature, longer cook and involves the cover being down for capturing the smoke flavour. Nothing wrong with grilling and it’s what most people want when weather is nice - some quick burgers and some chicken breasts etc. But doing a long low temp cook with a gas bbq is tough and expensive on the gas, things like slow cooked ribs, brisket, smoked sausages etc on top of the usual staple things will all taste far better on a bbq than on a grill, it’s just the way it is
no tutting needed