IMO:
1. If you have a very nice amp ( or if you are after the sound of the amp, regardless of what your bass guitar is ), use microphone.
2. Kung pangit ang amp mo, pero maganda ang bass guitar mo, use DI...
Connect the DI this way: Bass guitar>>>DI out1---->to your amp
out2---->to mixer
and not this way: Bass guitar>>>amp>>>DI>>>Mixer