>>1817158Purpose. If you cycle as a sport, higher end, purpose built equipment generally allows you to go faster, safer. If you fall for the "bikes ride on the road with cars" meme you definitely want something that can go faster safer.
If you're just saving gas going to the corner store and crossing gravel lots and park greens as you please a $25 thrift store "mountain bike" is sufficient after some cheap maintenance. If it's comfy to ride and you can bolt on as much useful shit to it as you need it's good enough.