Part of your decision should be made by what you currently have in the R&P dept. A 3.31 or better R&P is still liveable on the street with 33s, and will give you a better crawl ratio with a 4:1 t-case than 4.88 gears. But, a 3.07 or 2.73 R&P is not liveable on the street with 33s. The Tera Low kit is around $700, you can pick up R&P for less. BUT, the t-case conversion is pretty easy and requires virtually no technical expertise (most anyone can do it themselves) whereas an R&P change is a fairly technical endeavor which you may have to pay someone BIG bucks to do.