Don't forget that the 737 in EWR has the least commutability of any A/C and base in the system. Super early show times, (see 0430), and returns that are usually too late to commute home on.

IAH 737 is very commutable and has decent flying. The 756 and 777 are better than the 737. EWR is a pain due to the weather but has some excellent 756 flying.

Good Luck