Cream subway tile is a great choice for oak cabinets. Marks example is great. Here is mine:

https://www.houzz.com/photos/my-pics-work-in-progress-phvw-vp~110720042

This Bianco Dolomite would be a great option;

I would not like any patterned tile with a patterned countertop. I agree with cream subway tile being a lovely choice. Your granite is beautiful with lots of warmth and interest.

If I go with a cream/linen tile, should the grout be the same color or darker?

When the tile is up, but before it is grouted, it will give the sense of what a darker grout will look like. In general, with oak cabinets a grout color that is the same or only a very light contrast works best. A dark contrasting grout can look busy and will show any error in the tiling. Since older walls are often a little out of whack, getting a perfect looking tile layout can be difficult.

We use winter carnival a lot and typically clients chose a cream subway tile. You could look for something that has a texture or unique shape but a solid color. Definitely do not do a heavy pattern, a tiny sized, or a mix of glass, etc.

Keep it classy. A cream subway is your best bet.

Yes...cream subway with no pattern since there is pattern in both the granite and cabinet grain. I would match the grout color to the tile in order to avoid more pattern.