For me, I will encourage you to take Form 6 IF you can handle it. Cause for me Form 6 is better than Matriculation but if you think you can't handle Form 6, by all means go Matriculation...cause I got some friends who took Form 6 with me but turn out it was too tough for them and now they have to waste their time to re-start back at Foundation and Diploma level while most of us continue with out Degree....
But in term of education quality, i will say STPM is a much better and quality course and have more choices upon completing it compare to Matriculation...
But as for the statistic....i beliv in IPTA have more Matriculations...