50W vs 100W Repeater 10 Miles Radius Handheld vs Mobile Two Way Radio

50W vs 100W Repeater 10 Miles Radius Handheld vs Mobile Two Way Radio
50W, 100W, Repeater, 10 Miles Radius, Handheld, Mobile

I’m trying to set up a UHF dispatching system for a non-profit emergency service in an urban setting. There will be many buildings and I will do my best to find the tallest building to install the repeater on.

I was considering buying either VXR 7000 (50Watts) or VXR 9000 (100 Watts). The area I need the best reception is in a 10 miles radius and I have heard the 50 Watt repeater is sufficient. Nevertheless, I was recommended to use mobile radios because of portable (handheld) radios have lower watts (range). Thus I was hoping that by investing more on the VXR 9000 with 100 Watts I would instead be able to purchase a 5 Watt Handheld operating within the 10 miles radius. Considering the cost of mobile radios on the need to have to install them in cars it would be a huge burden. I would appreciate your advice.

RADIUS: http://www.mapdevelopers.com/draw-circle-tool.php?circles=[[16093.4%2C9.022736%2C38.746799%2C"%23AAAAAA"%2C"%23000000"]]