Bettas we know of today have been excessively mixed bred - regardless whether they were bred for quantity or quality. You will have a hard time finding a betta with "true" genes. One side effect is that modern type bettas are often harder to breed. So, IMO, it's not about certain types but rather ALL modern types (HM,PK,CT, etc). .... If you know someone breeding fighters/wild type PK/ traditional PK, you can compare their results to that of modern types and understand what I mean.
Some colors are harder to achieve than others. The basic colors are irids, cherry red, and black + cambodian. Combine them and you will get wild type colorings. But to achieve desired colors/patterns isn't as easy as it looks. Black melano's are harder to achieve because most, if not all, melano females are infertile. Thus you will have to constantly cross breed melano males to other colors (usually royal blue). Bright red is also hard to maintain because it is actually a mixture of genetic codes (red + blond). The same goes for white, yellow, orange, and other colors.
Certain patterns like a multi 3 - 4 color, a balanced butterfly, etc are also hard to maintain. Unless you start with the desired mutated genes, you will have a hard time creating them.
I agree with Basement Betta, breed colors that you love - that alone will give you a number of colors to choose from - specially if you work with combined genetic colors (bright red, white, yellow, orange, fancy multi, metallic, dragon, etc.)