Went to both 11@century and Bliss on different occasions.
11@ Century - spacious rooms, conveniently located near KSL, standard basic room fixtures and lousy breakfast
Bliss - Unique but small rooms. Better breakfast. But at night, streets around the area is dark and you wouldn't want to walk around the area.
I also frequent a 3rd hotel - j hotel at Skudai area. Booked the boutique room. Spacious and beautiful (2 years ago). I like it for its proximity to Beijing Lou - the best chinese restaurant in JB. There's only one mall there and quieter than KSL. If you don't like the crowds, you may consider this.