1st I'd like to start this with an:
Ode to my Red Alien
O! Red Alien
You are what I grab first
in desperate times.
You always place true,
with your four lobes engaged
soft metal to set up your home
inside the steep cracks
where you never stray
or walk far from there
and when I fall
you are there to catch me.
You are the one that I love best.
Anyway, there was some good debate on this site in scattered forums and threads about aliens vs. zeros. Discuss what sizes you like of each and why one's better.
I have never used zeros so I don't know.
As far as sizes for aliens, red's the biggest I like, but the best too.
Wouldn't you rather have softer metal on your smaller pieces to keep em from ripping out?