never used a string splitter, but I like the g5 even though I get a lot of rotation, I need to twist it about every 4-5 shots...
New strings man! Cures it right up, I had same problem...got some Bucknastys 1.5 years ago and STILL no rotation yet.
Never used either, but I'd go with the string splitter, it just seems so much more simplistic compared my peep right now..
Is neither an option? I prefer the super peep. That way I can change quickly based on my desires. SUPER PEEP <------ click