Btw, I understand the sentiment that blitz chess is closer to tnmt OTB chess than correspondence chess is.
I strongly disagree with that point. Yes, there is the fact that you have to play a whole extra game when you use a clock, but nevertheless the fact that you can actually think for reaonable amounts of time in cc makes me connect that to OTB more than I could say for blitz.
Avoid blitz, play longer games. Blitz/bullets don't improve your rating unless you analyse them. I'd stick with cooresponce games.
Playing blitz will improve your otb play much more then correspondence will.
"Several OTB grandmasters have used postal games, especially in their teenage years, to improve their analytical skills and opening knowledge and to deepen their general understanding of chess. When I interviewed Boris Spassky in Dublin in 1991, I asked him what advice he would offer to a young player wanting to improve. 'Play correspondence chess!' Spassky immediately replied."
From "Winning at Correspondence Chess" by Tim Harding
Also from that book, "'It is only half a game,' once wrote C.H.O'D. Alexander, one of Britain's leading post-war masters who took up CC towards the end of his life, claiming: "It does not make anything like the demands on character, willpower, nervous stamina that OTB does."
I think that is a fair and true critique of CC, though I'm not sure I agree that makes it 'half a game'
All of this however is in reference to pre-computer assisted CC. (Chess.com CC most
of the time) Computer assisted chess is a separate topic imho.
Blitz (against an evenly matched opponent) is tons and tons of funs! Addictive even. It probably doesn't do much for your slow-chess game but who cares.
I think a blitz rating is indicative of how well you play blitz. Kray-Z!