Outdoor ranges are cheaper to go to... also have longer lanes. I wish I was closer to the nearest outdoor range. About a 25 mile drive for me. The indoor range is a mile and a half away, but only goes out to 75 feet. It is air conditioned, though, which is nice here in 110 degree weather.
What's funny, is I bought my m1a there and they keep pestering me to bring it in and shoot it there! Maybe it's so they can steal all my .308 brass and I lose the ability to hit anything beyond 25 yards because I screwed my sights up shooting at short-range targets... I see people bringing in scope-sighted AR-15's all the time and I just wonder "why?!?"
Oh, well...
I go to the outdoor range maybe once a month or so... The indoor one once a week... There are maybe 30 lanes at my range, but I very rarely see a revolver and it's usually a 4" or shorter .38. Very rare to see .44 or larger there, except me. At least in my experience.
When I go, I usually take my .22 taurus and either my sp101 or redhawk, once in a while one of my autos, but less and less recently. Getting tired of chasing brass.
The indoor range seems to be very combat-oriented, whereas the outdoor range attracts more hunters.