I love both. Slotted head is limited on space so can manage a small.inlay. but a regular headstock has a good amount of space for beautiful inlay artwork to be possible.
I do prefer the look of slotted but I don't own any. With slotted the taper is much more aburpt and the headstock is much thicker. I have an issue with my left hand and that means I need to slide my hand up the headstock and I can't do it with a slotted.
I had a couple of guitars with slotted and did not like them. Much easier to change strings on a regular. Also the regular headstocks always are thinner in my experience.
Have both, like both. I came from classical guitar, and got used to the slotted style. The first custom build I got, a Zukulele, by Michael Zuch, I asked for the slotted, and it is a terrific instrument.
The build in-progress is a more traditional headstock, and has a unique, gorgeous inlay that satisfies my desire for bling, it's by Beau Hannam.
I mean, if you need an excuse to get another uke, different headstock works, hey?
I really prefer the look of simple standard headstocks with friction tuners. Though I am not a huge fan of inlays either. Inlays on ukes are kind of like tattoos on people. They are made by skilled artists no doubt. And some are truly awesome (tattoos and inlays). But the majority of them end up looking a little tacky to me. There are definitely inlays and tattoos that look beautiful and classy (MBs for example). But to me those are more the exception than the rule. Of course it is all just opinions and personal preference.
I love the look of slotted headstocks (a hangover from my acoustic guitar days) but I find solid headstocks offer a wide range of tuner choices (love the new Gotoh planetary ones) and are much easier to string with my clumsy sausage fingers.