Battery Set-up opinions

Just curious on what the opinions are on what is better? Running a 2 battery set-up with a True Battery Isolator or a larger 1 battery set-up. Last trip I went on while running my 30" Light Bar, 16" Light Bar, stereo and LED Whips I kept getting a LV warning. So after reading I see the 2 remedies but want to know what set-up you recommend and why. I removed the 16" Light bar and have not had any issues but in the future I want to add a winch so I figured I would take care of it now.

Rob