In the past two years, it seems like the only quality US candidates come from active recruitment - job ads do not seem to produce a high quality of applicant. Even after initial screening I still get people who can't parse a simple CSV applying for senior dev positions (you can use google, you get full credit if you copy-paste from stack overflow, you get full credit if you launch into a monologue about how parsing CSVs seems simple but there are a lot of hidden pitfalls, you can use any language you want, you can use a library or read the file and parse line by line and split (no trick cells with commas, all numeric), it's not meant to be a hard test). Some of the interviews are just brutal.
So really the only difference I've been experiencing is it's a lot easier to passively recruit in less competitive markets (specifically overseas), in the US I have to spend a lot more time ensuring I do things like volunteering for pitch event mentorship so I can find people I can encourage to interview for us or keep in contact with so I can actively recruit them if they don't enjoy their job.