I don't see any extra aminos...
Excell:
L-Leucine 3.5 g
L-Glutamine 2.5 g
L-Isoleucine 1.75 g
L-Valine 1.75 g
Citrulline Malate 1 g
Vitamin B6 10 mg
Xtend:
L-Leucine 3.5 g
L-Isoleucine 1.75 g
L-Valine 1.75 g
L-Glutamine 2.5 g
Vitamin B6 10 mg
Citrulline Malate 1 g
:rasp:
Go with Excell, it's cheaper, more flavors and mixes better (IMO).