The CPU core has 020 instruction set implementation. The 030/040/060 are different enough to cause compatibility issues with various software. The 020 has the majority of the extended instructions and fortunately most programs had to be A1200 compatible to be popular. So, the 020 (even if it's 100MHz+ in speed) makes the most sense for main stream compatibility. However, there is adjustable speed and a 68000 fall back mode that really takes it to another level.
The 060 daughter board is an 060, so you will be able to run anything and everything 060 specific with it.
Last edited by JimDrew; 21 April 2015 at 20:02.