Hi. I stayed in both within the last 7 days
Hilton in my opinion is the better of the 2 hotels for service, attitude of staff, location (hands down winner), access to public transport etc. Exec junior suit well appointed with great river views. Exec lounge awesome views with excellent canapés and good selection of wines, spirits and beers.
Cons. Nothing.
Conrad, very nice hotel, Hilton 8/10 appointed rooms, Conrad 10/10. Location for leisure stay poor with
no easy access to air train or MRT. Business hotel if needing to be close to embassies or similar, excellent.
Exec lounge nice but very second rate to Hilton.
Restaurants
Hilton, breakfast area unreal. Conrad poor.
I can't comment on other Hilton restaurants however next door to Hilton on river edge, fantastic outdoor restaurant. Conrad, Asian restaurant 2nd to none (expensive though)
Hilton for me, hands down winner. Look on my Facebook feed for pics of both hotels or PM me and I'll send you some room and hotel images
Both hotels treat status guests very well