"Better" is very subjective and depends on the analog gear being used. Every piece of gear won't affect your audio in the same way. I might also add that there are some people on the internet that swear on their lives that gear (mics, headphones, monitors, etc.) that can capture/produce sounds up to 48kHz are superior and sound better than gear that only does 20kHz. On average we can hear between 20 Hz and 20kHz, therefore you cannot hear the superiority and "betterness" of the frequency response. My point is, make as educated a decision as you can. Instead of reading, try finding audio examples of analog vs. digital so that you can judge for yourself.
To be completely honest, I think you can achieve "the analog sound" in your DAW. The main difference would be that analog gear would affect your audio automatically as it is run through your gear. With plugins, you'd have to manually adjust your plugins to get a specific sound....
And to address what you asked in your first post:
Your interface would need to be analog. I've only seen one computer in use + analogue gear for the times that I have sent a digital signal to analog gear or seen others do it. Not sure how to tell the difference between an analog interface and a digital one off the top of my head (never really looked at an analog one)