I personally love both companies servos, but I love Hitec's customer service and warranty way more.
I will say that the Hitec's seem smoother from end to end throw, the only thing Hitec can steal from JR would be the sweet machined ALU casing the new JR line comes in.
I'm sure once I have an issue it will be my JR servos first. It's just a gut feeling I have, but I still run both and love them both.
OOO and price point is huge. If I had to all over again I would have waited for the Hitec's to hit the shelf and only bought those since they are about $50 cheaper overall.