I use a mixture of different publishers. There is no publisher who can take into account a 4th grade reading level with a Kindergarten writing level. They cannot match 1st grade math with 2nd grade spelling. When I pick and choose I also get to choose to spend a lot of money on phonics (because I do not know how to explain all the rules) and less money on math (because that I can easily teach).
Another recommendation for: if this is your first year, keep life simple and buy and AIO curriculum. You know you are covering what you need to for the year and everything is all planned out. For your second year, keep a box, but sub out the one subject that you thought was weak in the curric. This gives you a couple of years to discover what works and how to get things planned out.