ND 10 stop filter system

Hi.
I want to try out with some long exposures during daylight. I want a 10 stop filter but i see so many different solutions when i google.

So i was wondering if you guyes have any experience to share.

I can either buy 1 filter per lens or buy a system which fits all lenses. (probably more expensive but maybe better in the long run?)
What would you guys recommend?

You're probably better off buying a filter to fit the biggest lens you have (or that you think you're going to get) and then step up (or down? forgot which) rings for it to fit the smaller lenses.

There is no system that fits all lenses, unless you count the rubber-band type. At the very least you'll need a ring adapter of some sort. If you go with the round, screw-in type of filter, then you can buy a step-up ring for each filter size you have below the biggest one, as Russo09 suggested. If you get a panel-type filter, then you'll likewise need an adapter ring for the thread size of each lens you have; the filter holder attaches to the adapter ring, which in turn screws onto the front of your lens.

Get a Lee Foundation Kit and a Lee Big Stopper. They can be hard to come by though.

Lee Foundation Kit
Lee Big Stopper
Lee adapter rings (they make several sizes to accommodate all lenses, go for the WA versions when appropriate).

You'll likely want some graduated NDs after playing with the above.