I came into the Launch with very low expectations so that may be influencing my overall impression.
I have only owned it for a few weeks but I have been testing it against the MaxiSys as much as I can.
I don't see high end luxury vehicles or the newest models. The MaxiSys seems to devote a lot of the development on vehicles that would still be under warranty or only wall street suits could afford to own.
The Launch has communicated with every vehicle I have tried it on, that includes 2015 models as well as vehicles from the early 90's.
I haven't had any issues yet, so no need for log files. But the Launch has a really awesome feature where it builds a list of log files for the last 10 vehicles you connected. You just go into settings, choose diagnostic feedback, select the vehicle and hit submit.
Updates are pretty frequent. I get a couple of updates per week. They are super fast to download and install.
The Launch user interface itself isn't as pretty as the MaxiSys. The overall layout of the Launch isn't as nice either but the tool itself seems faster than the MaxiSys. Navigating back and forward, in and out of menus and modules seems much quicker on the Launch.
I am pretty happy with it so far and I have talked a couple of friends into buying one. I suggest that you give one a test drive and see how it goes for you., everyone has different needs in their tooling.