What you're looking for, home building or investment?
Eden is a class. Would recommend going inside and see the development.
They're offering on 3 year installments. Only 10 marla and bigger size plots (1K, 2K, 4K and 8K) available.
In my opinion, River gardens still has lot of potential to grow in price, due to it's perfect location and standards of development.
Gulberg is a gamble in terms of investment as the bubble driven by dealers may burst anytime, and a big No for home construction, as it may take many years to be liveable.