The difference between the relativities of the SUM and RYM share price is all about history,sentiment and perception. RYM are the top dog due to their leading the sector in every possible way, they have a large international following and are in the top 10 healthcare companies in the world, they also have great rapport in NZ and know how to negotiate through consent issues(Even the most difficult ones) seemingly effortlessly. The level of care and what's on offer to their residents is top notch. SUM are a great development company but still need to up their game on the care side of things, in light of the above facts plus a few others, they deserve the price premium IMO.