With all the innumerable gaming mice out there, it can be hard to accurately test and gauge what makes a great gaming mouse. The laser diode technology has brought about a new level of accuracy that we can take advantage of, but the LED based optical system is not out the door just yet.
This is mainly due to the price differences between the two still being too big for some people to justify spending the readies. This is evident in these two Souris with the Ikari Optical coming in at around $40 and the Laser at $60 or so, but that doesn't just cover the cost of the laser diode technology, as the Ikari Laser is a far more advanced mouse in terms of features than the Optical, and this is reflected in its pricing as well.
If you are serious about gaming and feel that your current rodent is not giving you the accuracy you deserve, then I would have to recommend the Laser. It's an ergonomic and feature packed beast that will have you covered for many years to come.
However, with the multitude of gaming mice on the market now there is something to suit every ones budget, and I would have a hard time choosing the Ikari Optical given its current pricing and the features present.