You're asking a question that only you can answer -- and that's evident even in how you pose the quesiton.
In my own case, the Mack Brass euphonium was the best choice FOR me since I got it at quite a low cost but with a higher sense of reliability and customer support than I would have for a cheaper horn from Laabs. And I don't use it heavily (though there's no reason why I shouldn't). Yet when I bought my bass trombone, my criteria were somewhat different, and I bought a Schiller from Laabs.
In the case of my EEb tuba, I wanted very much again to buy from Mack (he was still selling them at that point), but ended up spending about $700 more for the one from Wessex because it had the raised lead pipe.
All of these are probably fully "worth the money", and none of them are likely less worth the money than the others. But they're different instruments and different amounts of money. You pays your money and ... The bottom line is that if you can AFFORD to purchase each of these horns, then you can AFFORD to get the one you really want -- and whether it's the one that's "most worth the money" isn't a fruitful question to even attempt to answer.
Gary Merrill
Wessex EEb Bass tuba (DW 3XL or 2XL)
Mack Brass Compensating Euph (DE N106, Euph J, J9 euph)
Amati Oval Euph (DE 104, Euph J, J6 euph)
1924 Buescher 3-valve Eb tuba (with std US receiver), Kelly 25
Schiller American Heritage 7B clone bass trombone (DE LB K/K10/112/14 Lexan, Brass Ark MV50R)
1947 Olds "Standard" trombone (Olds #3)