Just another thought, based on experience:
We use LM35A and have had as good or better results than Sensirion parts, and keeping it all analog keeps the system quiet. The LM34/35A are nice in that they are ready to work if you can read an analog voltage accurately on your system anyway.
Our situation demands the least amount of digital hash around the measurement area. We feed the temperature measure voltage into the same low emf scanner that's running other analog voltage tests on the system, and just treat it like any other analog Vmeasure in the test script. That's actually much easier for us than trying to integrate an I2C or SPI bus into the test apparatus - and then trying to deal with the resulting noise.
We also do a cal test every year and the drift is very minimal, usually < .02C or less, and over 2 or 3 years time it tends to average out to even less - we don't really see a major long term trend up or down. The datasheets are fairly conservative for the "A" parts - they run around $25~ or so. Not the cheapest solution but they work very well - the cans are nice since they don't pick up board stress / vibration nearly as bad as the SMT parts. If you have to, Add a 4-20mA current driver to the part and you're ready to ship the temp data over very long lengths of wire with virtually zero digital noise impact.