Music Maker is uses to affect material after it is recorded. I am assuming by "tracking" your vocals you are referring to recording... so in essence you are asking which is the best way to record your vocals.

If that is the case, you might get a wide range or answers... or none at all, as it is a very open ended answer.

Are you recording the guitar track and wanting to then overlay that with vocals or are you recording both at the same time?

Music Maker is not a multi-track recording software, so you have to use it to record one track at a time, it will not separate inputs.

Once you have recorded the material (voice, guitar), you can then add effects to that to change the audio material. There really is no "best" tool for that, as it is really based on the type of sound you are wanting to achieve. Since the effects are non-destructive, you can play around with the effects to find the sound characteristic you are after. I suggest just using an audio sample and start "playing" with the effects to get a understanding what they do with the material. This way you can start the recording process with the idea of the type of sound or effect you want, thus the creative process can take over.

Now, if you are looking for a Magix software that will allow you to record multiple instruments (voice, guitar) at the same time on separate tracks, then you would need to look at the Samplitude Producer or the Pro Audio line of Samplitude products... but even with the software, you would need specialized computer hardware allowing multiple inputs to be recorded simultaneously. 

I hope that something above was helpful.