I think that overall timex are better watches than casios. The timex quartz analogs that I own are clearly superior to those of casio. The former have a far tighter connection between crown and hands and in general have a better fit and finish than casio analogs. Timex digitals keep better time than casio digitals and except for G shocks are better built than casios. IMO timex ironman are as well built as casio g shocks but timex in most cases are more accurate time keepers than are casios. This may be due to the fact that timex manufactures their own quartz chips and may have better quality control over them.
Finally, casios have more stylish designs than timex but the latter did invent indiglo.