You get what you pay for with these things.
I don't reckon there is much to choose between Matki, Aqualisa and Showerlux. There are probably other brands, but these are the three brands that I look to, for this sort of high performance enclosure. Look for the overall design of the seals, especially where the door is.
Mine has two sides of shower panel, with the other two sides being fully tiled part of the bathroom walls. On installation, one has to pay a lot of time and attention to the way the base of the tiles are dealt with to the base. Mine has a very solid fibreglass base