Vespa is good for tall person. I suggest you to test ride the bike you like and choose the best for you. Vespa is excellent in handling, build quality, engine etc. Its a revolutionary scooter. But it is expensive.
Yesterday I confirmed mileage of my Vespa. It gave me 58 kmpl about in 1 litre very easily. It will easily reach 60 kmpl now.
Suzuki Swish engine is similar to Vespa engine and has good features like the side stand indicator. But Suzuki and Honda scooters lack front storage space, which is very useful. So its a big disappointment from both these brands.
Third option is Mahindra Rodeo. The fuel inlet on this scooter is at the front below the handle, which is very convenient. No other scooter has this feature, all have fuel inlet under the seat.
Fourth option is a simple and low cost scooter. Hero Pleasure.
I suggest you test ride all four, may be the other 2 you like and choose the best by comfort. Comfort should be your first priority. Also buy only from showroom, as the price of showroom and local retailer is same. You get original accessories from showroom and not from the retailer at the same price.