My understanding is that the Moon has far less useful resources. Sustaining any kind of base or colony on the Moon would require a larger degree of constant imp

My understanding is that the Moon has far less useful resources. Sustaining any kind of base or colony on the Moon would require a larger degree of constant imports and may be much harder to sustain. Another huge factor is the lack of consistent solar power. 14 out of every 28 days have zero solar. Mars doesn't have this problem. There are other lesser factors as well, off the top of my head: weaker gravity which may affect health, the psychological problems with 2 weeks of solid darkness every month, and less scientifically interesting. However, it may be still worth considering.