The Bronx, NY
Male - 26 Years Old
Tung sols are definitely solid 12ax7's. A lot of it depends on what you're shooting for tonally. I've had good luck with reissue Mullards. They have very bell-like high mids and the treble is round, not harsh. Keep in mind that your V1 position is going to have the biggest impact, tonally. I currently switched out my 12ax7 in my amp for a 12at7 to lower the gain, giving me more clean headroom, and I think, sweeter cleans and overdrive.
I'd recommend buying a few types of preamp tubes, see what you like. You really only need to change the V1 tube to make a really serious difference right away, so just buy one of each and see what you like. I recommend thetubestore.com