"I think it's going pretty well," said Whiting of the Halo.
"It's been tested quite extensively now, and I think it will offer very good protection for a flying wheel, for example, that's the main way it's been tested so far.
"We need to do a thorough risk assessment on it, we need to look at a number of other related things like extrication. We've got to talk to the medical crews about it. But I think it's going quite well.
"The Red Bull [idea] is an alternative to that. It's considerably further behind in development, it's never been tested, but it could offer additional protection. But I've got my doubts that it could actually be implemented for 2017, whereas I think the Halo could."
Whiting said that even if the Red Bull concept proved interesting for the longer term the Halo would still be introduced next year.
"I don't think we would delay if another one was emerging. I think we are on a course for the Halo, because that has been tested thoroughly, and we feel it offers the best all-round protection.
"We do have, as I said earlier, a thorough risk assessment to do on a number of different accident scenarios, we obviously want to make sure that we don't make things worse in certain circumstances, so that has to be done. But I don't think we would delay it because we felt there was another one coming."
Whiting acknowledged that teams need to know what the standard spec of the Halo will be as they are starting design work on their 2017 cars.
"That's what this little working group is for, in order to finalizing mounting positions for it, and the strength of those mounting positions, which is just as important of course. I think the end of May is the target."
He also pointed out that when Ferrari tried to prototype in Barcelona it actually proved easier for the driver to get out: "One team did put a Halo on their car, and did get the driver to see how quickly they could get out, and it looked perfectly simple, and arguably easier, because the driver can get hold of this thing and lift himself out much easier.