it's possible the guitars on the recording are double tracked which can help create a richer tone. Valve or solid state amps are down to personal taste really, i have both and use them for different bands. The valve amp gets used for rock or blues and the solid state amp gets used when i play with my punk band.
It's also worth remembering that it's not only the type of amp used that creates your tone, it will also be affected by the speakers you are using and the pickups in your guitar, if you are using any effect pedals and if those pedals are true bypass or not.
My advice would be to try out as many amps as you can and at different volumes, when you find the one that has the right tone for you, you will know. Trust your ears and you will find the right amp for you :)