SMLLC -- using attorney or service to form, does it matter?

[Bienes Raices]

I've decided to form a single member LLC (I'm aware of the negatives in doing that). Since, as I understand, the operating agreement isn't that complicated for a SMLLC, does it make much difference if I use a (reputable) service to save some money instead of an attorney?

(The reason I ask is because my friend is a lawyer and he told me that attorneys just use those services anyway to create LLCs)