While it can depend on the overall style of the room, as a generic statement I'd say that I wouldn't have one tile pattern meet another pattern straight on with no transition between the two. That's for most people and most installations. I think what you have to do is look at a lot of online photos. Or do mock up with your materials on hand. You may not be able to verbalize what you like, but when your eye sees it, your brain will give a "yea" or "nay" vote, and that'll help you define your style. Stye-wise...if you were going for a minimalist design? Simple? Clean lines? Minimal visual distractions? Then having one pattern butt right up to the other can look just fine. But the two tiles should relate to one another in some manner: Pattern, shape, size, color, texture, material, etc, etc. Some folk find pattern-abutting-pattern pleasing. But it depends on the tile, the pattern, etc. Others find it jarring. For a more traditional design, having a border or transition of some sort between them may be the better way to go. For a border or transition? If your shower wall was, say a marble subway. I'd terminate that pattern at the edge of the tub with a vertical run of tile. For a less busy look the tile for the vertical border could be the same used in the shower. If you want to blend details, it could be a darker tile, or something for example you used as an accent elsewhere in the shower, perhaps the same tile you used on the back walls of the niche. Easiest and safest is to use the same material as the shower tile. The vertical of the border will act as a transition between the marble in the shower and the backsplash pattern on the sink wall. In the end, trust your eyes and your gut. If it feels wrong, it probably is wrong. For you. Good luck.

3000 sf of Saltillo, demoed, the slab getting ground flat, plus a good quality wood look large format tile installed? Not doable with people in the house first of all. All of your baseboard, door casings, and doors will need to be redone or replaced after that thick mudset handmade tile comes out. Your looking at a couple of inches of height there. Figure 75K-100K depending if they sorta add on to the moldings and doors or have to actually replace it all. That’s something that if you’re going to actually spend the money to do, you don’t do it halfway.

@Ana Gutierrez: It’s least worth your time to research engineered wood. It’s not as expensive as people think and many handy homeowners are able to install it. It also goes over some types of existing floors. It looks the richest, especially if a medium brown is your preference. Laminate floors are the least durable and the worst in a wet climate. Any flooding, even a little, will ruin it. Luxury vinyl tile gets great reviews. The better products look more like wood than laminates. All of these can be bought in planks that are not hard to install. Tile, as was well pointed out, is ridiculously expensive and hardest on your back. Most vinyl will survive the dogs pretty well. I know a family with two Rhodesian Ridgebacks who installed luxury vinyl in the bedroom and bathroom of their twins’ suite. The mother wishes she had a reason to put it around the whole house. Do your research. Ask questions at flooring places so someone knowledgeable can answer about durability and dog-nail scratching. You can shop for bargains after you get all the information together. Don’t go to big box stores yet.

Yeah, that travertine look is a bit dated. Not bad, but just yesterday. I just found a very convincing bluestone look in porcelain. I’m getting the darkest one, but there are 4 color ways. I am also a huge fan of Saltillo and cement tiles. Cement tiles can be laid out and bordered to look like a rug, and come in solids too. They have a very distinct feel underfoot. (There are caveats with those kind of tiles, though - installing them can be tricky.) https://www.ceramictileworksmn.com/chamonix/