What is new on the Coros Pace 4 Pro?

A titanium bezel, sapphire glass, a larger 1.47-inch 3,500-nit AMOLED, doubled RAM and a new optical heart-rate sensor over the standard Pace 4, at GBP 389 / USD 449.

Is the Pace 4 Pro a successor to the Pace 4?

Not exactly. It sits above the Pace 4 and takes the Pace Pro’s maps-and-AMOLED slot, so the Pace family now has three tiers rather than the Pro replacing the cheaper models.

Which Coros Pace watch should I buy?

All three now offer offline maps and an AMOLED screen, so the choice comes down to how much a titanium build, a bigger, brighter screen and more battery are worth over the two cheaper models.