dwc undercurent

hey guys, im new to this so bare with me!
i've been reaserching horticultior for nearly 2 years. i've seen and helped with a few hydroponic grow's and am comfortable with the basics of it all. im building a small grow room, about 6m3 and intend to have 2 5g dwc plants in there, under 2 400w led grow lights (3w) with 6" fan and filter set. scrogg the shit out of them. i was wondering the pro's and con's of using a res and second bucket connected buy pump (undercurent system) compared to just having 2 individual dwc buckets and a nute mixing bucket?

thanks

with the scrog net, it might be hard to change res water, check ph etc without jarring the plants around. i would say a res/3rd bucket would be good for ph and ppm checks, and res changes. just my 2 cents!