Both of your LLCs, being single-member LLCs, are disregarded for federal income tax purposes so you will report on Schedule C.

For accounting purposes, you are probably better off separating the two businesses and filing two Schedules C. On the other hand, there is no absolute requirement that you do so.

However, you will have to file two separate Schedules C if you pay employees for each of the LLCs under different EINs.