for windy you wouldnt really need both phys and cold sunder, phys sunder would do just fine since torn would be the bulk of your damage. imo dr is a bit easier to make up vrs 70 cold res since you'd need enigma
fissure is a bit easier for mobs since you wont have to telestomp and you can get by with slightly crummier gear. (ravenlore vrs 2/3 pelt)
they use fairly similar gear, so i would suggest leveling with fissure to see if you like it.
you can also look on youtube for videos if you wanted some gear examples
Ilovemf is one of my favs to watch (fire druid)
windy druid vid (cant do 2 vids)
https://youtu.be/yqZolcFSZ4Q?si=mm6hLOdBAyccvqnt