Both spinners are going to be very similar.
The performance issues with Arkanoid are related to the difference between the original Arkanoid spinners, and the variety of other spinners available.
Games such as Arkanoid use a spinner that acts more like a paddle controller than a true spinner.
This is because the original spinners were designed to be "weightless".
Games like Tempest, Tron, etc... all used weighted spinners to allow them longer spin times.
The spinners made by Oscar and SlikStik are all the weighted type because "most" people want that type of spinner.
It is alot easier to play Arkanoid with a weighted spinner, than to play Tempest with an unweighted one, so the manufacturers are merely going where the money is.
The three biggest differences between Oscar's spinners and the Tornado are spin time, cost and footprint.
The Tornado uses less room under the CP by having a cylindrical weight on the shaft rather than a large encoder wheel, costs more, and has a longer spin time because it rides on bearings, rather than bushings.
I personally went with the Oscar DOT spinner because I wanted the Up/Down functionality it has, but don't think I would have been disappointed with the Vortex or Tornado on games that don't require the Up/Down.
Knob shape is probably the biggest area I would caution you to spend some time deliberating.
I personally hate playing games that have the "hat" shaped spinner (like Tempest), but there are others who love that style knob.