I think this will depend on the size of rooms I prefer 12 x 24 tile when possible and certainly not small tiles for floors the fewer grout lines the better IMO

If you want the herringbone style, then maybe you should consider the 4x12 tiles. Here is an example

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Here is an example of the 3x6 tile

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Thank-You everyone for all of the helpful advice. I actually had trouble Googling Subway tile floors online so it was nice to see a pic of a finished bathroom with it. Once again I am getting the advice to stay away from subway tiles on the floor so I think I will heed that in considering that I will be selling the condo someday. I am going to look up that blog now!

I'm not a designer, but I can give you the advice I was given from my designer as I just went through the same process. Her recommendation was 12x24 tiles in all areas (3 bathrooms and small laundry) as she thought they gave a more high-end look compared to square. My builder generally only uses 3x6 for backsplashes and 4x12 for backsplashes or shower walls..

I appreciate the input Jessica. Though I have no experience with this the advice from your designer resonates with me. I just do not like the look of square tiles of any size on a floor.

I have been to over a half different tiles stores and looked at any size square tile you can think of laid out on their floors and I just didn't like any of them.

So your input combined with all of the others has made me leave 3x6 tiles on the floor out of the running for even a small room as an option.

At this point I am going to request sample tiles of both the 4x12 and 12x24 and see how I like the look of each on the floor. You have already convinced me to go with the 12x24 (I think, this is terribly tough to make final decisions on these things) for the largest of the rooms. But I am thinking that if I like the look of the 4x12 in the 2 smallest rooms I may go with those two different tile sizes for the 5 areas. All of this input is helping!!!!

Generally, keep grout lines small. The larger the tile, the more difficult to get a thin grout line and a flat surface if you don't have great tile installer. The larger tiles don't always lay completely flat, so the grout line gives the "ease" the tile installer needs to make things flat as possible. If you are going to do herringbone, which is typically a large upcharge btw, then I like the look of a more narrow tile choice to get the pattern looking really nice. 4 x 12 for example. If you are just thinking simple layout then go 12 x 24. I would keep the tile choices similar when rooms are near each other. Too many changes in flooring creates a "disjointed" feeling. Like you went to a tile store and picked from the "discontinued" piles. Cheapens your overall look. I would also only do carpet in bedrooms, wood even vinyl wood, if cost is an issue, rather than carpet. No one wants carpet due to the allergy issues people have and animals, etc. I fear you have way too much carpet coming in? Good luck! This is not easy, so it might be worth hiring a designer to help consult with you on these basic decisions so you have the person who can keep the BIG picture in mind and everything is cohesive down the line. Hope that helps a bit along with the other inputs.

We installed a 12x24 tile in one of the bathrooms. I preferred the stacked style vs the staggered one

Stacked is nice, but be sure to understand the manufacturer's recommendations with the longer tiles. That way you can avoid the dreaded, trips over unlevel surfaces. To say nothing of the look. With this being a new construction, you should have a good subfloor to work with, but quality of tile people might be an issue. I would watch them closely to ensure you get what you think you are getting! Loads of bad tiling problems we see here.