What is better for Android in terms of design - native UI or HTML + CSS (in a standard WebView)?

Question

Android

We are writing an application.
While we are doing the default UI, we are designing the interface.
Then we are going to hire a freelance designer who will have to draw pictures, add them to our default UI and ensure adaptability - both landscape and portrait orientation, and mobile phones and tablets.
Which design will be cheaper and faster to develop - native UI or HTML+CSS?
Which designer for Android is easier to find?
UPD: There will be no cross-platform. I am purely interested in what is more familiar to designers.

Answer 1

Which design will be cheaper and faster to develop - native UI or HTML+CSS?

The designer is generally deeply on the drum on the development technology. What difference does it make to him, in what way will you program some kind of circle, for example, or an icon, - using java or web technologies? His job is to draw the interface according to the requirements.
The question of choosing a technology is important only to the author of the application; keep in mind that the native UI is incomparably more productive, but it takes longer to develop, and web technologies save time in development and allow you to make the application cross-platform, but all this at the expense of performance. So if the application is quite simple - you can also use HTML + CSS + JS, and if the slightest lags and brakes are critical - definitely Java ...
Incomprehensible question) Obviously, a bad designer is easier to find.
In any case, since cross-platform is not important, look for a designer who knows Material Design. This will facilitate and speed up subsequent development, since the material is documented and described for both designers and developers (and even web developers), but there will be problems with old androids (in terms of interface animation).

Answer 2

why exactly for android?) don't want to support apples?) and what is "native UI"? diagram on paper?