IMHO, the best method of generating keys for your pool is through a HW wallet as described here. The reasoning goes something like this…
As soon as you enter your private key seed (i.e. your 24-words) into a piece of software you can never be sure that this software or any of its libraries isn’t compromised and never will be. Who/What is reading your screen, your keyboard, your memory? How is it guaranteed that libraries (which the wallet process uses) cannot access that memory?
A HW wallet guarantees that the private key, which is stored in a special chip, will never be accessible from the outside and will never leave the device. An attacker will have to press the buttons on your device to get at your coin.