It’s not worth the extra money as we don’t get it cold enough for long enough to get any real benefit. If you live in a very cold area (north east coast of Scotland) and plan to do a lot of miles in the winter then you might break even at £500
but in comparing the 2 cars a heat pump would be at the bottom of my wanted list.
Having looked on Suzuki’s website, I believe we have all being reading into @paulnles question wrong , by focusing on the heatpump costing £500. This is not the case, as the Suzuki eVitara comes with a heatpump as standard factory fit, rather than a £500 option i.e the real difference is, the eVitara AP is £500 more than Frontera, but the eVitara comes standard with an heatpump, similar to how the Kona does to the competition.
Given Stellantis EV’s have had a pounding for real world range, I would say the eVitara is a better choice, regardless of whether it come with heatpump or not. There’s also the case @Oscarmax points out, Suzuki/Toyota are far more reliable and Toyota have had years of experience, when it comes to electriness and heatpumps in hybrids and the eVitara is just a Toyota and built by Toyota at the end of the day.
My mum, perhaps preconditions her Kona too often before going outand given it’s done whils’t no on charge, the heatpump has less of an effect on the cars battery, than if her car came without one.