jab step

[cocobeware]

When im stepping in with my jab i usually tend to take a diagonal step forward/left as opposed to a straight step.I find that because this takes me off line it gives me a good angle for the left hook to the body,Now as this is one of my favourite combinations i probably tend to do it this way nearly all the time.
So should i also be stepping straight forward sometimes staying on line if i dont intend to throw the left hook,Maybee for a jab,cross for instance ? Although having said that i do find i get good power in my cross with the diagonal step.
I guess what im saying really is there different steps for different situations either diagonal or straight forward ?