Anyway, remember: each version has its strengths and weaknesses. There is no one that is better overall over the others (Except in the cases of 2k3 and Ace which are enhanced versions of 2000 and VX, respectively). The best option depends on your project. The language you plan to use, the mapping style, resolution, and the ways you plan to distribute. I still use Ace and 2k3 myself and they work very well for my choices.
If you're new to the RPG Maker softwares I would recommend to pick up RPG Maker MV. It's the latest RPG Maker version out there currently. VX Ace and MV aren't that different, but they have some slight differences. Unless you absolutely want a certain feature that's unique to VX Ace, I would suggest MV.
RPG Maker VX Ace is the older version with Frontal view Battle system. RPG Maker MV is the Newest version which supports built-in Sidebattle system. Also, VX Ace is a lot simple to use while MV would seem a little more complex if you are New to RPG Maker Software.
Anyone here managed to never burn out on programming? My current limit is 3 months(6-8 hours per day, 7 days per week, 50 hour programming week on average), and then I just have to take a break, sometimes lasting few days(with at most 2 hours on programming per day). I've been always like this so far, so I admire those who can always be so passionate on programming
Automatic level scaling without an option to turn it off can be a very bad choice for a game. The worst I've ever seen was in Nightmare of Druaga, where if a power outage made your system turn off, the game detects it as an attempted cheat and overwrites your save while taking away your best gear, leaving you unable to progress at the late stages of the game, and unable to recover.