I used vector linux for many years. Its slackware based, small fast and effecient.
I sawitched to puppy linux and have not looked back. Its TINY (128 megs at base install) has ubuntu repos but it all runs in ram...
If you want fast and effecient and responsive/amigalike? puppy is it. Runs from cd, install to hd, or usb. I have mine on a 64gig usb drive. I can take my pc anywhere with me.
Steven