It absolutely depends on you trading type, there is no bad or good types. Actually there is raw, fixed and classic. So and there is a lot of difference I would reccomend you to take a look at yourself becuase there is spread difference as well as difference in trading platforms and assets you gonna trade. And most important type, as I said, It is your trading style. If you are high frequency trader you gonna need different if you are low frequency you gonna choose different ones! So I wish you good luck with that hard decision!