A practical comparison

Repairs, controlled seams or repeated decorative work?

These three shopping situations show why “more features” is not a complete buying answer. The b30 models share a stated 170 mm opening to the right of the needle, but they differ in how you control the motor, finish buttonholes, cut threads and equip the machine. Choose the situation closest to your routine, then compare the actual limitations.

I want mechanical controls for occasional repairs

The bernette 33 offers two front knobs, 15 patterns, a front-loading bobbin and five supplied feet. It is a reasonable option when simple seams and occasional mending are the main job, and you are comfortable controlling speed with a pedal. Its four-step buttonhole requires you to change settings among the sides and bartacks.

The b35 keeps mechanical operation but adds a separate width dial, a one-step buttonhole sequence and two additional supplied feet. Choose it if those are tasks you expect to use. It still relies on pedal pressure for speed, and its guide tells you to stop at the end of the buttonhole. Neither model supplies the electronic b37's speed-limiting slider.

I want a controlled pace and the option to sew without a pedal

The b37 is the closer fit. Its slider limits speed even with the pedal connected, and its start/stop button works when the pedal is disconnected. It adds selectable needle positioning, a top-loading bobbin and documented automatic stopping at the end of its buttonhole cycle.

That makes it useful when motor control matters more than lettering or automatic thread cutting. Its cutter is manual, presser-foot pressure is not adjustable in the comparison table, and the large extension table is optional. Buying it because a guide shows a table would miss the difference between an illustrated accessory and the supplied package.

I sew repeated garments or decorative lines and want fewer finishing steps

The standard b38 adds a pressure dial, automatic thread cutting, three alphabet groups and memory for combinations, with a table and hard cover supplied. Those functions can be useful across repeated seams or stitched labels. Its 394 patterns do not enlarge the arm opening or create hoop embroidery.

Choose the Yaya Han edition when its extra walking foot, specialty feet and cutting tools align with your work. The supplied walking foot is a real package difference, but it remains an attached accessory rather than integrated dual feed. If you already own compatible tools, the standard package may provide the sewing functions you need.

Check interacting requirements before choosing

On the b38 models, automatic cutting and stored pattern combinations have restrictions in twin-needle work. The guide uses the manual cutter for twin needles and does not allow memorized patterns in that mode. Do not combine the single-needle maximum feature list into an imagined all-features twin-needle routine.

Use matching scraps to check a buttonhole and the fabric chart to choose a starting needle and thread. Compare the finder results for your essential controls, supplied tools and real operating setup. Leave a preference optional when it would not make you reject the machine; a shorter, accurate set of requirements often leads to a more useful comparison.