between the two, I'd lean towards Regane, as it does more.
Techron is an awesome, flat out injector cleaner, high potency, and high price. The regane will lubricate the lines, fuel pump, and will all around work just as well, maybe not as fast. I used to use it to cure dieseling on my 1980 F-150 I6 that only premium fuel would stop. Regane stopped the diseling! (I couldn't adjust timing due to emissions).
Personally the Redline SI-1 is my favorite.