The Centara Hotel Udon Thani is really dated. It's virtually attached to the mall which is really nice.
Pannarai Hotel is very good and across the street from the brick house and next door to the pub, both are popular and very good.
The Pannarai's rooms pool side (306/406 is great) are quiet despite being next door to the bar beer area. Great location, parking making it a preferred hotel for our family. UD Town is just down the street, lots of restaurants and shopping. (Also brand new hotel within UD Town, 4 star).
UD Town is a great place for a break, enjoy yourself!