Hi! Which tuner I should buy for guitar and for pedalboard use?

Usually, even the cheapest board tuners work perfectly. The technology behind it is super simple and that's probably the reason for the low price. So yeah, get the cheapest one with a solid corpus. I can recommend this article if you want some options to choose from https://guitarsrating.com/guitar-pedals/tuner/best-guitar-tuner-reviews-and-buyers-guide/ . I hope it helps you.