My thoughts on pets like this is - 289 is a very middle of the road speed—it's average—it's not very fast, or slow.
In PVP many of the pets you go up against will be faster than that. Therefor, seeing you will likely go second anyway, I personally feel more power would give you an advantage. And if you decide to use Surge, that extra power will go first anyway.
The health breed will likely only soak up one enemy attack. After that attack is over though, they will still be going first, so it's better in my book to do more damage—it seems to be the only stat advantage this pet has.
In PVE, it depends on what you'll be fighting. Most tamer pets will still be faster than 289 and you will end up going second no matter which speed you choose. If you're battling pets out in the world, then speed may have an advantage considering your pet will likely be level 25, and the enemy pet will likely be lower speed due to stat loss.
It would be nice is this pet came with slightly more speed—even 297 would be slightly more than average. Then I would, say go for speed.