1.5 & 1.6 Rocker ratios - What's the diff??

What factors need to be considered when deciding on installing 1.5 vs. 1.6 ratio rocker arms?

I'm starting to but parts for an engine build and can't seem to figure this one out?

When you figure out what lift you want to run with he head your running, you can have it custom ground with that lift. Call up a cam company and have a chat with them. The ask a bunch of questions about your car, engine, trans and rear end gear ratio, etc....

This is not a expensive option at all.