The major difference in between airsoft fields and paintball fields is made by our ''nice friends'' (speedballers). Light gun, acurate, 25bps, running and sliding... So commercial paintball field are specially made for (speedballing). But they aren't always like in picture of the 4th post, with balloons and soccer grass. I do play Mil-sim paintball in a indoor far-west style field, but sometime I feel like I'm tire of playing with (speedballers) that why I'm slowly transiting to airsoft.
Mil-Sim Sports FTW