Metal. I like a beveled edge. This one is small, cheap, and worth its weight in gold:
https://www.vermontcountrystore.com/mini-spatula-with-wood-handle/product/58487

This big one is great.
https://smile.amazon.com/gp/product/B083WPDJKG/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

They've changed it a little. I don't see the bevel anymore, but it's thin and flexible now. I'm tempted: https://toadfish.com/products/ultimate-spatula?_pos=1&_psq=sp&_ss=e&_v=1.0

Wood is good to have on hand too though. This one is excellent:

https://smile.amazon.com/gp/product/B00X8K7MQO/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1