I'm not sure what you mean by 1 batt in the BF, I have 2 Lifeblue 125AH (250AH total) batteries in my bigfoot 10.4 with room to spare in the battery compartment. The batteries still fit in the slide out tray.
Lifeblue batteries 125AH:
Case Size: 12.5" x 6.5" x 8.5" Tall
Weight: 28 Pounds; Shipping Weight 31 Pounds
Case Size: Group 31
The 2 separate compartments in the NL seem to be a pain! If you want to connect 12V batteries in parallel, then you need to pay attention to how you connect the batteries together so the voltages are equal, you do not want 1 battery running at a different voltage than the other.
I was out for a week and battery voltage at rest was 13.1V, still rather full!
The bed is shorter (not a problem for me), the insulation is better, and no Heiki skylight. These are good for most people, but far more problematic than the non-opening skylight above the dinette in the BF or the extra temp controlled fantastic fan in the bedroom area.
I'm putting a 28" TV in my BF.
Also installing 200W solar with MPPT on roof, plus solar port for 100-200W additional portable panels if parked in sun. 1 panel and low-end controller just means I'm paying for stuff I have to remove ...
Both are great campers, pick the one that works for you!
BTW, in my early shopping I never wanted a dry bath, takes up extra space. But sure is nice to use, very happy with the nice dry bath with window.
Solar and TV are options on the BF, but cost too much vs. doing it yourself (IMO).
Dave