I have fitted quite a number of both these showers. Mira are in my opinion an excellent brand of shower. The Excel is an older model (still current) and will guarantee you a superb shower. You get a good lump of metal for your money which you would expect for that price.
The Discovery is one model in a new range of showers which I believe are designed to compete at the cheaper end of the market. A budget model probably, but not as you would notice. The quality is spot on.
Choose either of these showers, you will not be disappointed.
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