Yeah a lot of information can really fed you up and can lead to disaster! That's why always remember these:
10% of your time should be devoted to training and 90% on performing. Unlike the athletes, 90% of their time is spent on practice while 10% is on performance (live games, etc). As entrepreneurs, it's the other way around.
So to answer about MS vs MLSP ==> MLSP lets you capture and build your list for $10 and $50 per month and so on. While MS let's you do that either exporting your leads to icontact manually or you purchase their Elite membership at a higher ticket price and you can use MS to build your list automatically of course with some added benefits if you go with their Elite membership.
MLSP also has updated and weekly trainings while in MS, if you need the updated trainings, you check out their WWN (What's Working Now) issues and you can basically try it for $1 for the first 30 days.
Both have the same goal in mind, to HELP newbies and struggling entrepreneurs build a solid and successful home based business. Both are very good and its really upto to you on what to choose. You can either use MS as theory and apply it using MLSP. Or you can use MS and apply it using the MS system.
Either way, you will all be good
What really matters is when you APPLY what you LEARN and stay CONSISTENT with it until it PRODUCES RESULTS.