I think most has already been covered here but I’ll add/reiterate.
Best bang for the buck will be a form 1 stainless can 9”+ (heavy, yet effective), but you have do determine what your goals are and what is important. Cost, weight, length, DB reduction, mounting system, form 1/form 4, manufacturer and their longevity.
I think of it like taxidermy. Do you want to spend a lot of money, wait a year or more and get something you’re not real happy with for the rest of your life or do you want to spend a couple hundred extra and have something you’ll be thrilled with for the lest of your life?
With a few manufacturers going out of business and issues they’ve had I’d consider someone that‘s been around for a long time. There are a few that come to mind that aren’t around anymore to take care of cracked, defective, or damaged cans and people are S.O.L.. The new Thunderbeast Gen 2 cans are even lighter then their Gen 1’s and suppress even better with a great long lasting name that will be here for years to come. Just had an Ultra 9 Gen 1 approved right before they came out with their Gen 2’s, bummer but is what it is.
For my maximum suppression I just pulled the trigger on a TB 338 Ultra (probably have a Gen 2 before it’s approved but got a great price) and for light weight hunting also got a TB Dominus. The Ultra 7 Gen 2 would be a great compromise for weight, length, and suppression. I have a few cans, all have different purposes.
Buy once, cry once.