honestly, I've never felt particularly impressed with a tile game using hexagons over squares. Its mildly interesting, but I have not seen a significant change in game play arise from it. I would choose the easiest route for development/design, unless you have a specific reason other wise, that brings good value to the game. Players don't tend to care about how you internally developed a game, and instead only care about what they see.

One thing I'm especially interested in is why people choose hextiles over triangles?
Is it just easier for the artists or is there another reason?
In my eyes triangles do have the same cons as triangles, however tringles can have at most three different neighbours which means the artists wouldn't have to make as many combinations as with hextiles.

First off, if you think about it, a single triangle only has 3 facing directions in your game, like you said, but your map will require at least 2 directions of the triangles, or a lot of unusable space. You'd still require all the same work only now there would be angle complications to figure out depending on which tile your on. where as with square or hex, you always have the same available exist angles and paths. - less to deal with code wise, and for mentially dealing with it. with triangle movements, you can not create a straight line unless its only 2 tiles. anything more and your lines must zigzag. In squares you have 4 directions you can make straight lines in, and hex you have 6. Easier on AI movement too.

[quote name='shadowomf' timestamp='1357751564' post='5019529']
tringles can have at most three different neighbours which means the artists wouldn't have to make as many combinations as with hextiles.
[/quote]

in case this part was referring to creating textures for the background that interact, You'd still have the 6 sides to deal with like before, just in two separate tiles now. But also, you don't need your graphics layout to match the grid layout. I.e. you can use images of various sizes and shapes, tiles work fine, and then setup your angled grid for movement/placement on top of that. if a tile isn't 100% snow, then set its ground type based on what it most is.

One other thing about graphics, instead of using perfect hexagons, and expecting graphics to line up, I would recommend creating slightly larger hexagons, with alpha fading on the edges, which will automatically create seamless tiles with out actually generating edges and corners between graphics.

You didn't put isometric on this list, but I don't really recommend it if you are new to making games. If you are new to games in general go with squares. There is tons of free and placeholder art for you to use and the math couldn't be simpler.

If you've done a few complete games in the past and are just looking to broaden your horizons and such the hex grid may be a delightful challenge to prepare you for bigger things down the road.

Don't do triangles.

"- more possible combinations required because a tile can have up to 6 instead of 4 different tiles (materials/ground) as neighbours"

I would say that's a plus actually...

It's both. Beneficial in that it allows for more variation in tile terrain, but costly because it requires more work to make the additional transition tiles. I don't think the minor benefit is worth the heavy cost in most cases, but it totally depends on the project and the game being developed.[quote name='shadowomf' timestamp='1357751564'

[quote name='hpdvs2' timestamp='1357758082' post='5019569']
honestly, I've never felt particularly impressed with a tile game using hexagons over squares. Its mildly interesting, but I have not seen a significant change in game play arise from it. I would choose the easiest route for development/design, unless you have a specific reason other wise, that brings good value to the game. Players don't tend to care about how you internally developed a game, and instead only care about what they see.
[/quote]

I completely concur. And it typically takes more time and effort for these types of tiles (both in terms of programming and artwork), so it's really not worth the extra effort in my opinion. But isometric is similar enough and a frequently used artistic style that I think either flat square or square isometric tiles would be equally valid paths to take. The time you spend implementing something other than this could be better invested in something like improved pathfinding code, adding support for graphical effects like reflection, and so on.