> If I use square tiles and hide the seams between adjacent tiles, will it look OK?

Square tiling is very obvious, as you can see from the first example [0]. Hex tiling shifts tiles to a less obvious pattern. Also, as I can see from the video, tiles can be rotated while hiding the seams perfectly, which eliminates repetition altogether.

0. https://github.com/mmikk/mmikk.github.io/blob/master/picture...