Up normally for the best cut.
You can do either to be honest, but there is less chipping if you start on the top.
Try with a spare tile first to see how it works. The tile MUST be clamped so it doesn't move.
I would never use an angle grinder, and I have cut thousands of different tiles over the past two decades.
This what I would use, having used it on very small mosaic tiles in the kitchen, between units and worktop, and on marble floor tiles.
As Andy's said, use a proper tile cutter rather than an angle grinder. For most cuts, the simple score and break method works fine but for the more intricate things, I use a simple tile blade in a junior hacksaw frame.
A lot of professional tilers use angle grinders for cutting tiles, just check out the Tilers Forum which I frequent.
To be honest, it's a difficult skill to get right. The direction of the cut has to be right too. The blade has to cut into the material otherwise it will kick back.
I prefer to use wet cutters for intricate cuts. Bigger cuts I use my Sigma or Bellota for up to 1 metre tiles.
If you're only cutting a few, the angle grinder is fine (make sure you have enough spares, it's definitely a skill. But if you've got a big-ish job to do, a cheap wet cutter will pay for itself first time out.
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