it's true. several of my friends and i who play hon have tried lol. biggest up lol has is shorter queue times, but in almost every other respect, hon is deeper and more interesting game
pros
destructible environment
more varied pet classes
DENYING
developers listen more closely to community
free to play. there is no rotation. all heroes/champions are available always (barring new champions/heroes for two weeks)
neutral
art style
community (i happen to love it, though i know some hate it)
cons
queue times (up to 5 mins)
steeper learning curve
more difficult to navigate shop
no LAN
i think that's most of them. of course, this is from the perspective of a hon player, so take it with a grain of salt.