On mounts (on mobile its a pain to do formatting)
With the way GW2 mounts works you'll still be using your ground mounts, mainly raptor after you unlock either flying mount.
Griffon is like a jet. Great in the air, meh speed on the ground. You'll be using a ground mount on flat terrain simply because they are more agile and faster.
Skyscale is like a helicopter and closest to being a the jack of all trades when it comes to mounts. It still has about the same ground speed as griffon but you can hover just above the ground to use flight ability for a speed boost.
Someone actually did the math
https://wiki.guildwars2.com/wiki/Mou...speed_research
Looks like they haven't clocked the turtle yet.
Also license doesn't have any of the turtle skins. It's just the skins before that.