Easiest for (without loss of generality) US clients: Establish a US bank account and get paid with checks, ACH (in-country electronic transfers), or wire transfers.
Easiest for you: Establish a bank account in your country and instruct your US clients to pay you with international wire transfers.
US clients are often not very experienced with international wire transfers and it causes hitches for their internal processes and banks, so the US account option will save you a lot of friction on a per-client basis in return for having more headaches up front. (The easiest way to set up a US bank account if you don't physically reside in the US is to do it through a local branch of a US-homed megabank. Despite the general impression of a lot of freelancers on this matter, international commerce is in fact fairly routine and "the Patriot Act" -- Know Your Customer and anti-moneylaundering regulations -- are not an absolute barrier to this.)
You should probably avoid using Paypal for transfers of more than a few hundred dollars. I like Paypal, don't get me wrong, but they're not well-suited to running a consultancy on top of.
Easiest for you: Establish a bank account in your country and instruct your US clients to pay you with international wire transfers.
US clients are often not very experienced with international wire transfers and it causes hitches for their internal processes and banks, so the US account option will save you a lot of friction on a per-client basis in return for having more headaches up front. (The easiest way to set up a US bank account if you don't physically reside in the US is to do it through a local branch of a US-homed megabank. Despite the general impression of a lot of freelancers on this matter, international commerce is in fact fairly routine and "the Patriot Act" -- Know Your Customer and anti-moneylaundering regulations -- are not an absolute barrier to this.)
You should probably avoid using Paypal for transfers of more than a few hundred dollars. I like Paypal, don't get me wrong, but they're not well-suited to running a consultancy on top of.