I bring all my own gear, even if it means cutting down on topside supplies and clothes. Like others have said your regs are your life support. I know when mine are serviced, how they are taken care, what they normally breath like. The rest of my gear...comfort mostly. I am very comfortable in my gear. I have hundreds of dives on it and I don't see why I would trade that for gear I have never dove, probably won't fit right, and might malfunction due to lack of care. And finally the less new variables added to a dive the more likely it is, in my opinion, to be a safe and fun dive. Traveling adds one new variable right off the bat, so i try to keep it to just that one new variable.
ymmv