whether you use or write [something]쓰다 can mean “use,” “write,” or, in other contexts, “wear.” 를 is the object particle used after a noun ending in a vowel; 쓰든 presents an option or alternative.
KO: 이 도구를 쓰든 저 도구를 쓰든 괜찮아요.
EN: It’s fine whether you use this tool or that one.