I'll try to keep it short (you can find reviews on both here and on advrider forum, I posted on both sites):
Downtown - More nimble, takes less effort to throw around town, very easy to change direction,
faster from 50mph to top speed, better wind protection (if you're 5'11" or close - you'll need another
windscreen), more storage space. Better high speed handling, less frame flex. Bigger gas tank.
Cheaper tires. Dr Pulley slider mod does wonders, it's not faster then People in every situation.
People - Faster up to 50mph, more comfortable (both because of wheels and the suspension is
softer), feels more planted, harder to throw around but will hold it's line in a curve/bend better.
Better front end feedback. Twitchy at higher speeds and prone to rear end fishtailin on hard
decelaration (more so then most other scoots I tried). Good wind protection for the legs, clean
air on upper body, but no protection. More room to move around. Flat floorboard. Girlfriend says
it's more comfortable at the back then DT too. Better leg position for passenger (fold out pegs).
Brakes and top speed are about the same on both, the rest is purely subjective.
I got the DT300 after riding both, but I can see a lot of situations where People 300
would be better.. but it's the same vice versa.
Here's some pics,
People test bike:
https://picasaweb.google.com/105893937491000655510/2011KymcoPeopleGTi300DT300 test bike:
https://picasaweb.google.com/105893937491000655510/2011KymcoDowntown300iMine:
https://picasaweb.google.com/105893937491000655510/My2012KymcoDowntown300iABSQuestions!?