The comp'd bass patch is an electric bass sound... of course you hear the "guitar" (or the bass guitar?

) behind it.
If you need a synth bass, choose a synth bass patch.
As to your request of making a good bass for you... please understand that it is simply not possible, because nobody knows what you're looking for. There are tons of good bass sounds on the juno, they simply could be different from what you're looking for. And even if I was able to make a "good" bass sound, it could still be good for me and not for you. For example, I like the Comp'd bass patch a lot.
For the same reason it is impossible to say if a synth is better than another for bass sounds, or good for bass sounds or not. If you can program your own sounds, almost every synth is good for bass sounds. If you don't want to program your own sounds, you have to rely on presets. Then the only way is to try all the bass presets on a synth and decide yourself which has the presets that fit your needs best.