What features are important to you?
By this I mean the quality of cut, using your existing batteries, the amount of money you spend, etc.
I believe the new battery version uses a thinner kerf blade that the standard for mains powered saws (Festool/Makita mains are 2.2mm). IF this is correct, it's to save battery power probably, and the trade-off will be with finish quality. With a brand new blade you may not spot the difference, but a thinner saw plate (probably required for thinner kerf) will allow the blade to vibrate more, giving a poorer finish. It might (emphasize "might") also increase the risk of kickback if ripping natural stock. You might be able to use a standard tracksaw blade, which would fix the issue at the expense of more frequent recharges.
You can probably also resharpen fewer times. I've just had some tracksaw blades done by Leitz - came back like razors and can be done a few times more each. The cost is around 1/4 of a replacement good quality blade.
The battery saw might be heavier than mains, but much easier on site. Mine is 110V and it's a nuisance lugging the transformer around. Also the Makita design requires two batteries, and both need to be in similarly good condition (or one may damage the other if you run 'til flat - it ought to have protection built-in: I'd ask as batteries are expensive).
Using the "kerfing" depth-stop pass and with a cleanly-cut splinter guard on laminated or veneered sheet, I get excellent results on both sides of the sheet (on the "keep" side of the cut). You will probably get the same with the battery version.
The thing is really, to try both for heft and other stuff, to see which you feel comfortable with.
Don't be misled by "36V" incidentally - it's not really making the saw wonderfully more powerful. The issue is that the application uses too much power for a single battery to last for a worthwhile amount of time (it's a limitation of the energy density of the chemistry and battery design mostly, not Makita's fault really). A mains motor will be more compact, lighter in weight and probably more powerful too. But unless you're plunging for sinks in worktops all day, that's probably irrelevant.