Just thinking about it theoretically, I would think the flat plastic hinges (which I think are robart?) would be easier than the round ones. The round ones, I would be nervous about the fact that they can turn radially, and if they are off by even 1 degree, you're screwed. Personally, I have not found a hinge I am confortable with. I used the CA hinges and had a failure. So now, when I install them I put them in, drill a hole 3/4 through it (from the bottom), fill it with thin CA then put a T-Pin all the way through it and clip it off flush.

One other thing, and maybe if I ask here I can avoid posting a whole new question, is that I am building a Venture 60. From past experience with my Great Planes Hinge Slotter, I am very nervous about cutting these slots with the cutter. How do you cut the slots with the cutter such that the blade stays completely straight and not wander at an angle? I feel as though I am not explaining this right..