Is a teaching license a teaching license, period, or does it matter what level the license is?

I have an MEd, years of teaching experience (college mostly, and high school private tutoring), but no teaching certification. I read in posts from a few years ago that the easiest US State in which to get teacher certification is Massachusetts -- that for their preliminary license I don't need to student teach, all I need to do is take the MTEL because I already have a Bachelor's degree. I'm wondering if that's still recommended/has anyone done this? I.e. can I use the Preliminary Teaching License from Massachusetts in my applications?

MA Ed Dept Info:
(http://www.mass.gov/edu/government/depa ... reliminary License )

Where I read about the MA license option:
http://matadornetwork.com/abroad/how-to ... l-teacher/

Thanks for your help!