Thought I'd bump this back up as was about to start a similar thread myself.
Keyword research I don't use either for, I use other online free tools. But my current approach is this:
1) Add keywords to MS and check out the monthly searches and title competition. I've found that MS doesn't fetch back ALL keyword stats in one go. So I keep copying - pasting - deleting and then checking the remaining keywords again. I do this until I'm confident all keywords have been checked and the data has been returned
2) From the list of keywords that have survived the filter (search and title comp) I then put these into LTP
3) I let it run and then check them all for the 'Average KC'
4) Any that come up under 35-40 I'll consider ranking for.
So as things stand, I'm using them both.
But one mode of thinking is this: As LTP evaluates the top 10 results, is Market Sam actually needed at all? After all, it doesn't matter what the Title Comp is really, it's down to the Top 10 results as that's where you want to rank.
What's people's thoughts on the above?