Without starting a ford vs chevy vs dodge vs toyota war, which I am sure this will, BUT...

I have personally set up and run just about every 50cc class engine made. I used to purposely stay away from the DA50 because I did not want to fall for the hype. Yes it is a good engine, but so are the others. Well, I was an idiot. The DA50 is the strongest, best running, lightest "set it and forget it" engine you will ever run. It truly is THAT good. The 3W 50 is the only other engine that comes close as far as power and reliability, in fact the 3W may have the reliability edge as far as lasting longer between major overhauls (bigger and more bearings), but the DA weighs a lot less so it wins for that class. 50cc planes can become heavy pigs in a hurry so a lighter engine sets you up for success.

The DA is not overrated. The minute I put my first one in the air I was sold. I have not needed it, but it also helps to know that the DA-50 is backed by the best service policy in the industry. I fly DA singles and 3W twins.

So, in order of preference:

DA-50
Brison 2.4
3W-50
BME-50
ZDZ-50

There are other engines as well like Fox, FPE, etc.. they are not bad, but they are not DA.
I rated the Brison second because it makes almost as much power as the DA, runs very well, and is $150 less!!

Bottom line, it all comes down to personal preference. DA costs the most, but I feel you get the most, so keep that in mind as everyone shoots me down for recommending the DA!!

DP