Recursion: 4 ways to get it working

[Dimster]

Hi Tempodi ... I think I've learned more on Recursion in BASIC in this past month than the past year trying to decipher Recursion from the internet. If the speed between Iteration and Recursion is fairly equal with present day computer power, then it's the depth (how many matriosca's) iteration can perform more than recursion. Of the 4 recursion methods demonstrated, is there one which may have more depth to it than another?