If you're kegging your brew, look to putting the dry hop addition into the keg right before it goes in to chill/carbonate. I'm not alone in doing this and having solid results (epic even). For one thing, you're not tied to the <2 week time frame with the hops in there. I've had the best results with leaf hop (nothing happened to the flavor of the beer with pellet, just the appearance altered after a few months).
As for the actual fermenting vessel... I've been using converted commercial kegs that I altered about 9 years ago now. Never had any issues with using them with non-pressurized fermenting. I've also done three batches under pressure in some of them (three different sized units).
Once I move, I'm going to look into stainless conical fermenters to migrate to which have the provisioning for using glycol chillers. I like stainless steel for several reasons. Not the least of them is how NO light can get to my brew once closed up. Plus I can use steam to sterilize IF I ever need to.
One of the guys who uses the fermzilla product, on youtubers, mentioned how they're really only good for so many batches/years. They eventually start to break down and then will fail. That can be accelerated depending on what solution you use to clean them with (and contact time). I use PBW to clean everything (nothing I have has a negative reaction to it).
People use what works best for them. I won't be looking to get the cheapest unit when it's time for the conical(s). I won't spend stupid, but I'll get the features I want right out of the gate (even if it's ones I can only see using a bit down the road). The fermenters I'm using now (and for the past 9+ years, didn't cost me all that much each. Mostly due to buying them smart. I had a welder install the gas ball lock base in the top of the (most, except for the 50L and a couple of tall 1/4 bbl I picked up later) keg via TIG welding. I have TC caps that mate to the opening where the spear goes with a thermowell and liquid post. My 'rev 2' is going to have all three items on the TC cap (both ball lock posts and a thermowell).