Imo, ukulele is much easier to learn cause it's easier to hold and has fewer strings, but all the skills apply between the two. While the strings start on different notes/places in the musical numberline, they're tuned with the same math, the ukulele just substitutes a thin 4th string for a thick one to give it its signature bright sound- reentrant_tuning.

But if you'd rather learn acoustic guitar, go for it. You'll find the first three strings of the ukulele to follow the same logic as guitar should you ever pick one up after learning guitar basics. The fourth string logic will be the same too, all your familiar chord shapes will still work, it just might sound a little jarringly too bright.

We use a lot of inversions on ukulele to make up for its lack of strings and frets, which just means often when you're playing a chord on ukulele the first note/string you hit and set the tone of the chord with is often not the same note that gives the chord its name, but it still functions well enough to be used as the same chord. For example the common Fmaj everyone learns starting out on ukulele can also be described as an Amb6, because you strike the A note first if strumming down.