I will say that all 3 of these produce slightly different shift "feel" with the manual transmissions I've tried them in. In my current test vehicle, the Redline actually shifts better over a wider temperature range than the other 2. The GM shifts best when cold to warm, and the Mobil 1 is just "ok" but not great at any temp.
Another post of mine with the BMW MTF-LT-2 shows it looking similar to the Mobil 1 ATF with a couple minor differences, but yet it produces another slightly different shift feel. Next on my list will be some regular dino Dex/Merc ATF's and some fancy BMW MTF-LT-3. Possibly the RLI as well, depending on when I get tired of testing or settle on a fluid.
Keep in mind that the "GM Manual Trans & Transaxle Lube" tested above is only suggested for use in vehicles where ATF is the suggested lube. From everything I've seen this stuff appears to be a repackaged Dexron 3 ATF, since GM is now pushing only Dex 6 for automatics.