The latitude of your launch site would be the optimal inclination, as the relative inclination between the LEO orbit and Moon's orbit matters very little for delta-v cost.
A lunar transfer orbit is very long and skinny, so at lunar encounter, the spacecraft's velocity (< 200m/s) is much less than the Moon's velocity (> 1km/s), which means that its ...
Long term, and it must be in LEO?
There are many things to consider:
any LEO orbit's plane will drift, due to the shape of the Earth, so no orbit will stay aligned with the Moon's inclination.
You likely want a somewhat high-inclination orbit, so that your normal trajectory to the Moon arcs far north or south, thus avoiding the worst of the Van Allen belts.
I like this question and the broader ISRU return fuel for Mars in general. So I thought I'd throw my two cents worth even though I'm not qualified ... So lets start by sizing an Earth based 10kw solar panel system, and scale up from there.
...This means that to install the panels for this ...