PUMP.
Thanks,
SUAT
For pure pump, my choice would be citrulline malate in a 2:1 ratio.
In vivo, citrulline has shown to convert to higher levels of plasma arginine than from consuming the same dose of actual arginine. Plus, there’s far less stomach distress for most users.
There are conflicting studies on PubMed concerning CM's effects on improving anaerobic performance and reducing muscle soreness, but some studies only examined the effects of acute doses.
CM's vasodilation effects, however, seem uncontested. If a pump is what you're after, you will probably see favorable results from citrulline malate.