What you pay
The Aquasonic Black Series is $54.95 CAD on amazon.ca; the Oral-B Pro 300 Sensitive Clean Vitality is $29.78 CAD. That $25.17 gap is real money, and what you get for it is the whole question.
Cleaning action and modes
The Aquasonic runs a sonic motor at 40,000 vibrations per minute across four modes: Clean, Soft, Whiten, and Massage. The Oral-B uses a 2D oscillate-and-rotate action at around 7,600 oscillations per minute with a Sensitive mode and a Daily Clean mode. Different technologies, not a straight horsepower race, but the Aquasonic's four modes give it more flexibility, including a dedicated whitening mode that owners report noticeably reducing surface stains from coffee within a few weeks of use.
Battery life
The Aquasonic's lithium-ion battery lasts 30 days per charge, with users consistently confirming a full month before needing to top up. The Oral-B Pro 300's NiMH battery is rated for around 8–10 days, and independent testing found real-world use closer to 7–9 days. No battery indicator on either brush, but the Aquasonic's wireless charging dock is far more convenient than the Oral-B's pin-style stand, which takes up to 22 hours for a full charge.
What's in the box
Aquasonic ships with 8 DuPont brush heads and a hard-shell travel case. At three-monthly replacements, that's roughly 2.5 years of heads included. The Oral-B Pro 300 comes with one brush head and a charger. Nothing else. Replacement Oral-B heads run roughly $5–$8 CAD each depending on pack size, so the gap in total cost of ownership over two years is wider than the $25.17 sticker difference suggests.
Build quality
The Aquasonic handle is IPX7-rated waterproof with a matte satin finish. Hands-on reviewers note the materials feel a step below Oral-B's premium lines, but solid at this price point. The Oral-B Vitality line uses a tapered handle with a rubber grip that earns consistently positive marks for feel-in-hand. Neither brush has a pressure sensor, which is worth knowing if you tend to push too hard.
Value for money
At $29.78 CAD, the Oral-B Pro 300 is one of the cheapest points of entry into oscillating electric toothbrush territory and does the core job cleanly. The Aquasonic at $54.95 CAD costs nearly double, but includes 8 brush heads, a travel case, 4x the cleaning modes, and a battery that lasts the month. For anyone who travels or wants flexibility beyond a basic daily clean, the Aquasonic's bundled accessories close the value gap fast.