There are a few different services, but with prior experience creating accounts, I would recommend utilizing the @steemmonsters account creation tool.
I recommend this option because it comes with great support if something goes wrong.
I recently created an account for a friend through the account creation service, and something went wrong, luckily @yabapmatt was able to help me. Had it not been for his support, I would have been out an account, and the money.
If you utilize this method, it's easy, seamless, and comes with support. You really can't go wrong.