During my first year of playing poker, I was tossing around what to choose. And I came to the conclusion that I like MTT better. The cache started to make me sick. Just boring. MTT is more interesting, there is more risk, more emotions.
It depends on how "beginner" you are. If you a really starting out of scratch, I would only recommend to play Freerolls, until you have at least build a couple of money to yourself. When we are beginner we are not playing too much either way: we are going to spend most of our time studying poker. If we do play 2 hours per day, we ar going to study 4 hours.
Do not play too much when you are beginning, and do not invest too much as well. If you are going to invest begin with $10, $ 20 at most.
MTT is in fact, a game full of thrill and emotions. But the variance is huge and the frustration, overwhelming. I would recommend to play cash, single table, not fast tables by any means. Also do not play 6-MAX, but Full Ring. Cash Game will teach how to play postflop game and how to master it.
Do not play more than 2 hours per day, until you are very confident. Always consider that you are a student and you have a lot of things to learn, so spend time with theory, analysis and practice.
However, if you are really starting to play, I would recommend a deposit, only freerolls and Play Money tables. Until you get some ideas of player profile, table profile, ranges, perceived ranges, etc.