Would be interesting to know if revenues and profits match that valuation at the same 10x coefficient.
However, Uber is more global, therefore has much more large cities around the globe. It wouldn't be unreasonable to assume that on average cities are 2-3x larger.
This alone could justify valuation gap. I would also assume that because of global presence, Uber has higher usage due to travellers.
[1] http://uberestimator.com/cities [2] http://www.theverge.com/2017/1/25/14383370/lyft-expansion-ne...