I record my Bass direct into my Focusrite. I then flip through my preferred IKM Ampeg Sims until I find the one that fits best with the song style and mix. I have one SIM that I favor and usually record initially with that, but check the others later to make sure that another doesn't fit the song better. From there, I will add a little compression. Right now I am really liking the Waves CA 76 Compressor on my bass. Then I EQ, rolling off everything below 25 khz and everything above 2K. I have some notches in between that I either cut or bump slightly, depending on the mix. Some of those notches cut a little mud, others bump some of the upper frequencies if I want a little more high end definition.
Most of the time, I am pretty happy with my Bass tone. I am sure if I had some really high end hardware I could probably do better. I also really like the tone of my amp mic'd, but usually don't go through all of the set up time to do that, when I get pretty descent results through the Ampeg SIM.
However, more important than any of the above...is a really good Bass, set up well, played really well...and number one, great timing. The ability to play with great timing tops everything, to me.