Invoker alone solos this LoL team. Tornado into EMP, Meteor, and Deafening Blast. Activate refresher orb and then Meteor and Deafening Blast again. Invoke EMP and cast it afterwards. Team wipe rampage. GG WP
This is an argument that has lasted for quite some time. In my opinion, I think DotA heroes would win.
Obviously factors can change depending on the homeground of the battle, now imagine a map completely split along the river and remove Blue, Red, Roshan and Baron.
Give both teams the gold gain of LoL (because Dota has a lower gold gain than LoL and would throw off LoL players). Early game LoL would have the advantage, but because DotA can deny creeps they can gain the advantage and under level LoL champs. By 6 most heroes would immediately get the upper hand. LoL champs have summoner spells like flash, but Morphling can escape further than flash and on a lower cooldown.
Since oracle potions were removed, heroes like invoker and brood can escape using ghost walk and Webs... A LOT... and veno with a shadow blade, don't get me started.
LoL champs have a scaling system of AD and AP, which is OP in a MOBA. The two Items in DotA can somewhat equalise this, BKB and Blademail, can render Most LoL champs useless in a team fight temporarily.
However in the roaming stage being half of the LoL champs are damage dealers being alone in the jungle or in lane is deadly for DotA heroes.
So long story short, LoL would win killing off a single target,but because DotA heroes have an early game advantage, team advantage and team synergy. Dota would win in this fight.