Like, Vypyr vs. Spider? I would have to say Spider since i've never tried a Vypyr. But Peavey Tube amps (3120,6505,JSX) are AMAZING compared to the Spider Valve which is total shit.
I have a Vypyr and my friend has a Line 6 Spider IV. I bought the Vypyr because I didn't care much for his amp.

Line 6's have a ton of effects, but 90% of them aren't worth anything. You can get some really nice sounds out of the Vypyr.

Mathias Arp does some nice stuff with the Vypyr.

Here's one of his videos:
Line 6 Spider vs. Peavey 5150, Peavey wins.

Peavey Vypyr vs. Line 6 Vetta, Line 6 wins.

It all depends on the models, not the brands. Unless you're talking about First Act or Ibanez amps.
What is better, reading the rules or not reading the rules?

My vote goes to reading the rules.
Feel free to call me Kyle.

Quote by ibz_bucket
Just so you know, I read everything you type in a Mike Rowe from Dirty Jobs voice.

Quote by tubetime86
I mean in Kyle's case, it is in the best interest of mankind that he impregnate anything that looks at him funny...