I have spent a lot of time with all 3... man that's a tough one. This is all subject to change but here's a dumbed down version of my mental flow chart if I personally had to decide which one to get.
make or break in this flow-chart of a decision is the viewing environment. If it's a bright room with ambient light and you can afford it... Epson 5050.
make or break; if gaming and sports are really at the top of your list and you can afford it... Epson 5050.
if neither 1 or 2 and viewing in darkened or low ambient light I will most often recommend the BenQ as I feel they represent the better value in for this viewing type. Especially the HT3550.
Things to consider....and this is really really high level so glossing over stuff here....
If movie watching is primary content and 4K HDR content makes up the bulk of and movie watching is at the top of your list, I personally prefer the auto HDR tone mapping of the HT3550 and HT550.
Then there is the cost. HT3550 is $1,499. HT5550 is $2,499. 5050UB is $2,999. So if you can afford the $3k, the Epson is the best all-rounder. But if you are in a darker environment and viewing is mostly movies, tv shows, etc.... I'd recommend saving some buxx and getting an arguably better no-fuss HDR image with the HT3550. The HT5550 is incrementally better in almost every than the HT3550. If you have an extra grand you'll get better placement flexibility, color, and marginally better contrast with the HT5550.
Hope that helps... other things to consider is the placement requirements of each and usually design doesn't go into decision making but I've known some to return the Epsons due to the behemoth chassis alone. But that shouldn't dissuade most people.