This is an interesting match-up question, since conceptually they are on opposite ends of the drum roasting spectrum. On one end, you have a ridiculously overbuilt, thermally massive, manual gas roaster and the other you have a lithe, automated, efficient, induction-based roaster. I have extensive experience with the North and absolutely none with with Bullet. What's interesting for me is that I ended up with the North for precisely the reason something conceptually like Bullet had not existed a few years ago. At that time I wanted something like a high-capacity automated Hottop appliance - something maneuverable I could plug in the wall in my kitchen and run under my hood. The large-capacity Hottop that was anticipated years ago ended up as vaporware, and the Huky was the only effective compact 1lb drum roaster that could work in a similar capacity, though the Huky was gas roaster and certainly not an automated appliance. Driving towards even greater capacity, I was drawn to the Electric version of the TJ-067, since it seemed to have the bones (element coverage, wattage, 25amp SSR, etc.) to obtain full 1kg roasters with electric power. And it had a PID, so the possibility of automation was there. I eventually transitioned to the gas-version of the North roaster for the superlatives associated with gas roasting, but had to sacrifice automation in the exchange. However, that wasn't too much of a limitation as I ended fully automating my North (which I've detailed here
). But make no mistake this massive roaster is not an appliance in must be relegated to the garage; so forget the kitchen.
From a marketing perspective, the Bullet is very differentiated from this since it has its appliance-like sweet spot, though I cannot attest to its performance at high capacity or attest to it's long term reliability and viability (product and/or company). And using induction is an essential design aspect here because there is no way you can drive 1Kg roasts to completion with a 110v source in a kitchen. My current house has induction burners and the efficiency and speed of heating pans is unparalleled, though as you might expect, I still prefer gas burners as they are easier to control, gauge, and predict. Perhaps the same translates to drum roasting but at this point its conjecture. But to keep the Bullet roaster small, efficiency is the name of the game and induction is the way to get there. OTOH, for induction, you need a lot of proprietary circuitry so you are locked into the manufacturer. Comparatively, the North is low-tech; driven by simple, generic, non-proprietey, line-voltage components. If Mill City/North Coffee were to go belly-up at some point, you'd still have a roaster that would be serviceable 20 years from now. And the hardware is so freakishly overbuilt, I can't imagine any mechanical parts wearing out in my lifetime.
Regarding automation, I'm a believer in it (enough to automate my North), and while I can't attest to the programmable capabilities of the Bullet, it would certainly factor in my decisioning. But automation is of little value of you can't make the roaster do what you want it to do by controlling it yourself at your target batch size. While the verdict may still be out with the Bullet since its still fairly new and in the early adopter/majority stage, the North is well established in this regard. I've been using it for 3+ years and have thrown everything at it without incident; its performance and reliability is a given. For this reason, I would rely more heavily on feedback from the Bullet community for your decisioning.