Having owned several Anvil cases for applications other than a horn----HEAVY and perhaps a bit overkill. If you go with that option--get wheels. I'd look at an SKB or Bonna.
As an aside, I travelled to Spain with my college band with the standard Yamaha 321 case and never had one scratch. Minnesota to NY to Spain and back. Again, it was the 80's and horns weren't nearly as expensive as they are today- so I probably wouldn't do that now.
Euphs:
Miraphone 5050 Ambassador
Wessex Travel (Tornister) Euphonium 'Maly' ER154
Yamaha 201 Baritone
Mp: Wick SM4 Ultra X
Groups:
The San Diego Concert Band