The RST Gila T5 is a Tiawanese entry into the low-middle range of suspension forks. The Judy TT is in the same catagory. Either fork will perform well, depending on your riding style.
Neither fork is designed for continual aggresive riding, they are designed to make a mid-line entry level mtb feel good down an intermidiate trail/dirt road.
They both offer a certain amount of adjustability, the RST has more "gadget" features and options, while the Judy is a little more straight forward. Both have optional soft/medium/hard spring options, but the kits are much easier to get for the Judy than the RST.
For the price, either fork is about equal in performance, however, the nod goes to the Judy as far as servicibility and availability of parts. RST products have traditionally been sort of a BIC lighter of forks-use until you break it, then get something else.
Ed