I recently read an article extolling the virtues and explaining the science of Clear Care contact lens solution. Within the article, its authors made the point that store brand (generic) versions of solutions are not and should not be considered interchangeable for name brands.
Growing up, I was always taught that generic medications were the same as their brand-name counterpart, and I think a lot of people believe this to be true. In the world of eyes, at least, such is not always the case. Following are three reasons to buy brand name contact lens solution:
1) Inactive ingredients often vary between brand name and generic solutions, and these variations may result not only in decreased eye comfort (more irritating preservatives, etc) but also decreased efficacy for the intended task (not as effective for disinfection, etc). One comparison would be to drink a glass of apple juice and assume you’re getting all the nutrition that you would receive from an apple – the main ingredients are the same, but sometimes the little details make a big difference!
2) Often overlooked in contact lens care is the importance of regularly changing your lens case. Almost without fail, whenever a widespread problem with contact-lens related eye infections develops, it is found that a ridiculously high percentage of affected individuals had cases that were many months or even years old. Brand name solutions typically give a new case with each bottle of solution, whereas many store brands do not.
3) With brand name solutions, you always know what you’re getting. The formula doesn’t arbitrarily change, so if it works for you now, it should work for you next year (assuming you’re using it properly!). Store brand solutions don’t have this reliability – if the company selling the solution finds a different manufacturer that they prefer for whatever reason (probably cost), they can switch whenever they want and you’ll never know. But you may wonder why the solution all of a sudden stopped working well for you…
For more information about proper use of contact lens solution, read my previous post on the subject.
Costco Eye Doctor 
Fiona Stapleton PhD out of Brien Holden Institute also found that when you properly clean and replace your contact lens case (or just eliminate the case with daily disposables), you reduce bacterial load by 62%.
I prefer name brand over any other. It has the most viscosity and cushion for me any way. But then I am one of the few hard lens wearers left!