Is it worth the money to switch cameras?

Currently, I own and operate a sony dslr A330. I've had it for about five or so years now, and I've been thinking about switching to a Nikon D3300. I was just wondering if it was worth it to switch cameras and how much better the nikon is when compared to the sony.

I don't know

You have one of the last Sony digital SLR cameras which have optical viewfinders and use Minolta/Sony A-mount lenses. That run has ended and now all Sony digital, fully adjustable cameras with interchangeable lenses have electronic viewfinders and thus are not a great choice if you shoot sports or any action. They also burn through batteries very fast when compared to a digital SLR with optical viewfinders.

But here is the deal. Why would you want to buy the lowest cost, entry level Nikon digital SLR?

Nikon cameras are considered "better" for certain uses and because they have over 80 different lenses available. If you really decide to move over to Nikon, consider buying a good used Nikon D300 or D7100 from KEH.com. Those cameras are not limited to using Nikkor AF-S lenses because they have on board auto-focus motors and have a built-in time lapse photography feature among other things.

If you spend some time on the Nikon and Sony websites, you should be able to determine which brand fits your needs as a photographer with five years experience using a fully adjustable camera.

In the end it is your money and you have to decide how to spend it.

I can tell you that when I'm shooting along the sidelines at sporting events, I do not see any Sony still cameras.

But do consider NOT buying the entry level version of any camera system you decide to enter. You have enough experience now so buying an upgraded camera, even a used one makes more sense. KEH.com guarantees that the cameras they sell work.

I have been shooting sports and action for over a decade and my current two cameras were build and sold in 2007, so not new, yet I do not see either of them dying on me any time soon. They are a Nikon D300 and D3, both very substantial, sturdy cameras

A330 was a entry level DSLR and so is D3300. If you are really into photography I would suggest you to spend a few more extra for D7100 or D5200(almost similar price as D3300) or D5300. In last 5 years the low light performance of DSLRs has improved quite a bit. You can also consider midrange sony dslrs if you own multiple lenses.

It's not much better nor is it worse. You will get the same picture no matter what camera you choose. If you find yourself having difficulty with the Sony system, control layout and lens availability, it's worth jumping ship. If you are happy however with what you have already, there's no point switching.