Yes, I can see how pound for pound the fly is a better delta bet, and I agree Nov/Dec would be preferable to Nov/Jan if it were available. But at this point I like the long vega exposure, in particular because I plan to hold this position into early to mid Nov.
As a general rule when you make primarily directional trades, is your goal for vega simply to keep the exposure under your delta exposure, regardless if it is short or long vega? And is part of the reason you prefer the fly due to the short vol hedge if the underlying continues to rise?
Thanks,
ST