Ela,
I believe it is totally personal preference but because I had not done this style of workout before I chose the 6 month. I am so glad I did. When I got started with meso 1 and there was only a 30 sec. rest everthing is going pretty fast (and although I have grown accustom to it) in the beginning it was hard to concentrate solely on the the muscle the first go around. I feel doing it a second week , I know what i s coming and I can really get down to business. I really love this style of traing and am really seeing gains in strength already so I know when I get into meso 2 it will really start coming together.
Rachel