On 03/12/2020 02:29, Mirko wrote:
> hello,
>
> max size for pi 3 B plus is 32Gbite or 64Gbite  ?

64GB certainly works. I've not used a larger SD card as I move to using
a USB3 memory stick or SSD for better reliability.

> And the speed ? It's convenable use SD UHS II or III ?

Prior to the Pi 4B the SD card interface is quite slow, so UHS-I is more
than sufficient.

So I would just go with a Samsung or SanDisk 64GB UHS-I. Smaller sizes
don't tend to be any cheaper now, and I'm not finding class 4 or 6 cards
  have any better random access speeds than a good UHS-I these days.

---druck

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