I'm almost to part 135 mins and am seriously considering it over going to a regional. Before I started instructing, it seemed like 1200 hours was soo far away. Then I finished my first month as a CFI and realized this is the fastest way to build time. I get 100+ a month, gain instrument experience and make decent money for a CFI. I think it looks like job security increases on the 135 side, so that's where I'm leaning.
It couldn't hurt to get your mins with what they're paying instructors now, so take the safer route and look to the regionals once things settle down.