amplifier with volume control

I began my journey with an active preamp then switched to a placette passive which was more transparent but sucked the life out of my system (but I was using longer interconnects to monoblocks).  I have one source (a computer with a usb dac) and am now running direct to my amplifier which sounds much better than my previous 2 configurations. I am using a digital volume control and my thought is to change to an amp with a built in volume control - like an audion - or have a tech install one on my amplifier. My question is how is an amp with a volume control different - if at all- from a passive (simple pot in a box) connected with short interconnects to an amplifier?       thank you