A person named something like "Zacharayx" on the Speedcube forum has a video on Lubix and minimally compares it to maru lube.
I know that Maru lube tends to dry out quickly, doesn't have a good container unlike Lubix which is in a easy-to-apply-syringe. Maru lube is liquid which can get messy when applying it.
I have heard of people saying that Maru lube can do little to no effect on your cube while as every cuber that I know of enjoys Lubix.
Lubix is high viscosity silicone, lasts very long, producer of Lubix said that it can last in a well lubed cube for 6 months. Lubix is in a nice syringe container. Very little is often enough for a cube, many people accidentally over lube with lubix. Lubix is very expensive for those who don't spend hundreds of dollars a month.
Good thing though, is that people have found many variables around Lubix which works the same IF NOT better, and this includes Differential Oil, Help Lube and many other anonymous small lube producers. I've even heard of a lube called "Bubaloo lube" but I have no information on that though.