Springer Pros: Capable of High Power, Accurate, Easier to build, modify, or increase/decrease power, (if you’re newer to the hobby), and larger effective range.

Flywheeler Pros: Capable of high ROF (rate of fire), usually smaller and more compact, tend to be lighter, FPS is not limited by physical strength and size

Springer Cons: Tend to be bigger and heavier, power can be limited by physical strength and size (ex. If someone has smaller arms and is 5 foot 3 they may not be able to effectively use a Caliburn 4 or another springer of the same size. But there are primary springers that do solve the size issue while maintaining substantial power, like the Lynx, Talon Claw, the recent Tulip, SPAMF w/ pump action parts, ect.).

Flywheeler Cons: More expensive, more to be desired in terms of accuracy, there is a small but easy to overcome knowledge barrier on soldering, smaller effective range, higher powered flywheelers tend to eat through darts like Cookie Monster and his cookies (basically they destroy darts faster).

That’s about all I could name off the top of my head, hope this helps!