The ES is an old Granda Royale property. Many parties are held there and it has not been maintained. It is also located right off I-10 so it can be noisy and not a very nice view.
The Hilton is located at the airport. Not much going on there either.
If you need a Hilton property you may be out of luck in the El Paso area. However, there are a couple of old hotels downtown with some character - I don't know there names but you may want to inquire.
If you get a chance, you may want to go Las Cruces, New Mexico. There is also a Hilton there. Good luck!