Done both DT and OT for multiple MDS. Both are rewarding, but different. Functional DT/OT test teams talk; the degree to which that happens is personality dependent.
AFTC: you do a bunch of work, get a couple heavy hitter issues fixed, and then the SPO takes the credit.
53 WG: you do a bunch of work, get a couple heavy hitter issues fixed, and then AFOTEC takes the credit.
If you are the sort of person competitive for both TPS and WIC, understand their missions before submitting apps. Both camps attract people who don't understand their purposes.