Go for outdoor! Unless: it’s very hot ( you don’t wana shvitz while takin pics 😉 )
It’s very sunny ( the lens that your camera or the professionals camera may not be high tech. In scenarios with sunlight)
If there are too many distractions ( my best friend had pictures taken outdoor and there were many people and dogs not to far from where they set up to take pictures in a grassy area )
Goodluck! I’m sure they will come out great either way indoors or outside!