I only donate to the candidate. I only donate directly to President Trump via his official campaign website. I never donate to the RNC.
Make sure you read the small print on the bottom. Most of them says not authorized by any candidate.
Example
Paid for by the
Committee to Defend The President
Not authorized by any candidate or candidates committee
www.CommitteeToDefendThePresident.com
Use of the name and likeness of any candidate, officeholder, or other individual is for the purpose of this PACs political communication only and IN NO WAY indicates any authorization by, affiliation with, direction from, or endorsement by that person of any kind.
I don’t see any disclaimer like that at donaldjtrump.com.