Both of them are very loyal to Harry, but I picked Hermione, only because of Ron leaving in DH. But he did return and save Harry's life. Still I had to pick one, so...

They're both loyal.. but Hermione stayed with Harry through all the hard times.

absolutely

Both are unbelievably loyal to him, but I'd say Ron is a bit more. He may have left in DH, but that was because of the horcrux, it kind of took over. As soon as he left he tried to come back but couldn't. Ron also risks just a little bit more for him, though they both risk A LOT for him. I just think Ron is an itty bit more loyal.

By far in my opinion. How many times has Ron ditched Harry due to jealousy or whatever? Exactly. Hermione never ditches him.

Goblet of Fire- Ron refuses to talk to Harry in the Triwizard Tournament.
Deathly Hallows- Ron ditches Harry and Hermione.

they have never fight:). so Hermione i guess. When Ron ditches they in DH,I can understand him,he is deeply in love with hermione.

Ron's pretty selfish, and he and Harry get in fights pretty often. Hermione's always there for him.

goblet of fire - ron refuses to talk to him
deathly hallows - he leaves them, but later returns but still and him and hermione have never fought except for that one small one during the yule ball

You know.. she's without all the jealousy and stuff >.>

Poor Ron, being an inferior friend and all xD

I choose Hermione because she is not jelous and she neverleft Harry when he needed her but inthe seventh book Ron saveshim so I think both.

Both of them in general, but the bit in Deathly Hallows when Ron leaves Harry and Hermione alone, isn't good.. But he makes up for it when he saves Harry.

I say both too, in their own way they support Harry. You have to have different sources of support, which both deliver.

He stayed with Harry when Ron had gone ( in 7 part)