I'm interested in finding a mtb to add drop bars to, but I was wondering about sizing.. do you want to go with a slightly larger than normal MTB side, like how road bike sizing is bigger than mtbs? i'm talking about traditional horizontal top tubes, not slanted ones.

i've been seeing this one bike on CL.. it's a 22.5 which is on the larger side but still in my size range for me at 5'11". I'm thinking it might be better suited for a drop bar conversion compared to a 19" frame i've been eyeing. The DB Apex I ride now is 20" and overall the sizing is good, though i feel like i could stretch out a tiny bit more when going all out. the larger frame will give me the longer top tube so that's why i'm thinking it woud be more suited for a drop bar conversion.

any thoughts from people who've actually done the conversion?