Oled will provide much better image quality, but you need to make sure your viewing environment is not too bright, most oled is glossy and not really bright unless you go high end model. Besides, it also depends on your viewing content, the extra price of oled only worth it if you gaming or netflix a lot.

Nope, most anime is in 1080p, so it can't utilize oled's 4k. Oled is only worth in when you watch HDR content which can be found on netflix, Hbo,etc or gaming.