I just spent so long writing a reply that I was logged out when I tried to post it and it deleted everything

This is an opportunity for me to summarise my bullshiteeee!
Firstly, if I dial in a decent metal tone on both amps, I'd say they're in a similar ballpark. I really wouldn't worry about the Kraken's metal credentials.
The EVH sounds great, but channel 2 is the go to dirty channel, so I can see the fact that it shares gain & volume with the clean channel to be a potential problem (I can't relate 1st hand, as my 15W doesn't have a clean channel). Channel 3 is quite scooped sounding and has way too much gain - and I am a "you can never have enough gain" person.
If you read up about the Kraken footswitching options, you'll see that there won't be any channel volume matching issues.
The Kraken has more than enough gain on channel 2, and really responds amazingly to the guitars' volume control. I'm really not very good at describing tone, so I'd just say if you like what you've seen/heard in the videos, you will like the amp. I can get so many more sounds out of it than with the EVH. I take it you've seen the official video and the Chappers/Andertons video?
On a negative note, the Kraken doesn't look as cool as the EVH - however, it is smaller and lighter (and comes with a carry bag).
You won't have a problem competing with/slaying a Powerball with either of these.
Where do you live? Is there no opportunity to at least try an EVH?