I don't think it's faster emersed, but it sure is easier. I have in both submerged and emersed and while the submerged growth is faster it sure is a little more trouble than the emersed growth which requires little to nothing from me. If you can provide it a good environment go for submerged to get bulk, but keep some emersed in case that crashes, this way you will always have a starter piece again.
Hope that helps
Giancarlo Podio
Hope that helps
Giancarlo Podio