I read the same sources and made the same decision. I learnt TuRBo and used it for about a month before moving to M2.
What I really struggled with is accuracy, because setting up two pieces simultaneously meant that I had to remember the order of the setup moves. With TuRBo, you'll often do 4 or 5 move setups, a 10 move alg, then undo the setups to solve two targets for a total of 18-20 moves, or 9 or 10 moves per target. With M2, each target is typically 3 move setup, 1 move alg and then undo setup for a single target at a time, which is just 7 moves per target.
Also, because you only need to set up one target at a time for M2, there are only a handful of setup moves (21 in total) which become ingrained in muscle memory very quickly. In TuRBo, you have to setup two pieces at a time, which gives 432 different combinations of targets, which take a lot longer to get into muscle memory. Even after a couple dozen solves with TuRBo, I found thinking of setups a considerable mental effort, whereas with M2, it was automatic and effortless after only 3 or 4 solves.
In other words, contrary to what those sources say, M2 is both more efficient and has easier set up moves.