Best split king adjustable bed bases

Top pick: Ascension Luxe Adjustable Power Base — the strongest all-rounder here. It's a 750 lb-capacity power base with the best track record of the group (4.6 from ~1,500 ratings), and it's the one I'd put under a split king for a couple who want quiet, dependable motors rather than gadgets.

Who the others suit:

• Sino Luban Split King — the best-rated true split king (4.7 from 40 ratings); pick it if you want two independent halves and a simple frame.
• Marsail Split King with Massage — for anyone who wants massage and preset positions without paying premium-brand money.
• Irvine Home Collection Split King — a straightforward split king with generous head and foot incline; good if you mostly want the split, not the extras.
• Ascension Ultra — the step up for a heavier sleeper or someone who wants a no-box-spring setup and a longer-lived base.
• Casper Adjustable Base — for tinkerers: lumbar adjustment, programmable positions and anti-snore presets.

Two cautions: the SHA CERLIN split king has a weak rating (3.7) and charges shipping, and the Vipbear split king sits at 1 of 5 — I'd skip both. Check the weight capacity against the heaviest sleeper before you buy.