Remote Sensing Systems (RSS) is a private research company founded in 1974 by Frank Wentz.
RSS is a widely cited source of data on the satellite temperature record.
Research by Carl Mears, Matthias Schabel, and Wentz, all of RSS, highlighted errors in the early satellite temperature records compiled by John Christy and Roy Spencer at UAH,[1] [2] which had previously showed no significant temperature trend, bringing the derived satellite data into closer agreement with surface temperature trends, radiosonde data and computer models.
[3] The 2011 correction to UAH data is closer to the RSS data, but differences remain, for example, in the Lower Troposphere global average trend since 1979, RSS currently have +0.133K/decade while UAH has 0.140K/decade, while the mid-troposphere difference is even more marked at 0.079K/decade and 0.052K/decade respectively.
[6] I would have to say that the surface data seems more accurate because several groups analyze it, including some who set out to prove the others wrong, and they all get more or less the same answer.