Well then perhaps you can answer your own question at least to some degree.

When analysing the states of lucidity in both REM and hypnagogia, did you feel in any way that, say, the hypnagogic lucid dream was tougher to..."keep" or perhaps control?
Any other observations from both states and even logical deductions that you might have may prove useful to bring more thought on the matter.

After all, since you differentiate the two lucid "dreams" and see one as hypnagogia whilst the other one as a dream during REM then there must have been some differences in the state? Or were they only physyological?