It has to be better than epoxy on something that expands and contracts as much as copper does. I've repositioned 6 or 8 and non have leaked. It's definitely not something you want to do more than once, so pick your poison I guess.
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My point had to do with maintaining proper hose routing in the tight clearance area behind the engine block, not if resoldering increases the chance of a leak. I agree there is a concern with thermal expansion/contraction when using a coupler and epoxy. I have attempted to minimize this by using a copper coupler (same material as the tube). If you've been able to resolder the tube(s) and maintain good hose routing behind the engine block, then that would be the best. My estimate of how much repositioning would be required to be able to feed the "bended" tube thru the firewall suggested a problem with the hose routing. If in your experience the hose routing is not an issue, then resoldering to reposition the tube is a better solution.