Basically steels gonna be more comfortable than aluminium alloy. However, if you do want horizontal t/t alu frame, ridleys tend to come in this formation. Pompino or surly would prob be my choice.
Canti's are the "winner", get some of the old style like the old mafacs if you can, paul price makes bling interpretations of these or iirc Tektro/(one of the Tai companies) do something similar.
As for pushing; I ride 61" on road which is nice, but also compatible with off-road work, try something around the low sixties and if you need bigger or smaller, change your sprockets accordingly.
Basically steels gonna be more comfortable than aluminium alloy. However, if you do want horizontal t/t alu frame, ridleys tend to come in this formation. Pompino or surly would prob be my choice.
Canti's are the "winner", get some of the old style like the old mafacs if you can, paul price makes bling interpretations of these or iirc Tektro/(one of the Tai companies) do something similar.
As for pushing; I ride 61" on road which is nice, but also compatible with off-road work, try something around the low sixties and if you need bigger or smaller, change your sprockets accordingly.