took both in 2013 exams.
comparing between the 2, it is definitely MM which is more tedious. format changed in 2013 exam. last time, out of 8 qns choose 5. now do ALL 8. but still 3 hrs paper

i think it's like 99% cannot finish the paper. u dont have much time to think. read finish qn, attempt alr. you will be rushing to do the qns and time's up. still possible to do well BUT only if you really put in a lot of effort. if just chill relax, wont score high. requires practise and more practise. Dr Phil will upload a lot of past yr qns, coupled w his solutions. so you dont need to worry abt lacking of prac qns. he is approachable and willing to help. but you got to get used to his accent. it'll be alright after a few lessons.
MSM is easier and requires less effort compared to MM. there will be 1 theory qn which spans over 3 topics, other qns can be qualitative or quantitative. iirc, max of 3 theory based qns for the entire paper. if you are under Mr David Quek, you'll have access to his Mi Ji ie compilation of qns. there's abt 80 qns or so. possible to master the art of anwering qns. quantitative qns are like step-by-step way to do. do note there can be part b qn which ask abt theory when part a is abt cal. marks weightage on theory part b not that much though, ans quite standard.