The 2050 vs. the 3550 is significant in that the 2050 will have a bit better contrast, but it isn't a 4K/HDR capable unit. This is a tradeoff of price and is very much personal preference. If your goal is to show 4K content on screen, then the 3550 can do that, while the 2050 can't. From reports, I've heard that the 3550 is a decent looking unit for entry level 4K. If you want to go the 4K route, it's not a bad decision, and someone who bought the 3200 from Epson and the BenQ, returned the Epson as the BenQ just looked a bit better.
That said, these are all entry level models and won't deliver the black level quality that you get from the Epson 5050 or a JVC LCoS projector like the RS540. Still, you will be paying twice the price to get into that class of projector.
Did you already buy the screen? Is that the appropriate size for your viewing distance and space? Is the room properly painted dark on the walls and ceiling with dark carpet?