Add toilet to laundry or just convert to a full bathroom.

I have a 3x1 and having only one toilet for the household is a pain. I was thinking of adding a second toilet into the laundry, but I'm now wondering about going the whole hog and adding a shower too. This would also require making a 'euro laundry' (basically the washer is in a cupboard). Would a second bathroom be a lot more desirable in future than a proper laundry room, given it will cost a fair bit more to do?