i have a radio rated at 10W and a radio rated for 5W output. mine 5
watter isn't a handheld but this is typical output for that genre.

assuming they are using the same antenna what is the theoretical range
difference between the two and what is the practical range
difference? it seems the price difference is 2X to 3X. is the price
difference justified?

i guess i'm asking "should i ebay the 10W unit and find a better use
for the remainder?"