BF20 vs X3

What one is better/easier for cnc conversion?

From looking at the stats, the BF20 seems better and is cheaper, but, what are the 'pros' to the X3.

BTW, I will be milling medium sized parts, but with a lot of small detail that needs to be relatively accurate. Made from aluminum or stainless. And want the option to upgrade to a 4th axis down the road.

Also, what do you think of this for my needs?
https://www.machinetoolswarehouse.co...cat=317&page=1