Hi,

I think the Conrad orchard is a little bit further out than the other 2 hiltons hotels ( Hilton orchard and Conrad centennial)
The Hilton orchard is close to the shopping area on Orchard road where as the Conrad centennial is closer to the marina and gardens by the bay but both are close to the transit system
Both have executive lounges
I think the choice will depend om what you want to do ( the Conrad will be nicer but likely to be more expensive)
There is also the Hilton Garden inn in the little india area

regards

tbs