Hi grarpamp,
onion.to is down due to various problems (and it's looking for a vps donor!). what do you mean that this urls are not reliable?
in the tor2web.org round robin there are 3 nodes that do not share the stats. this is why you are getting different results probably. in addition one of the three nodes is still running a not updated version that do not include the yesterday stats.
the best thing you can do to have something reliable is to select a specific ip and make request to it (e.g., https://65.112.221.20/antanistaticmap/stats/yesterday)
the documentation is here: https://github.com/globaleaks/Tor2web-3.0/wiki/OpenData
in addition i suggest you to follow this project https://ahmia.fi/stats/viewer
ciao,
Giovanni Pellerano (evilaliv3) HERMES - Center for Transparency and Digital Human Rights