Recs.
Updated
Specs
Pros
Pro WSDL caching
While it is known that SUDS can have slow performance with large WSDLs, as it must download and parse the entire WSDL on startup, it has the handy feature of caching the WSDL. If you know that the file will not be updated regularly you can cache it for a specified time, otherwise it will default to cache for 1 day. By doing this you save the client from having to download and parse the entire WSDL each time it connects.
Cons
Con Outdated
It's been more than 2 years since it was updated. It is outdated to the point that its hosting point (fedorahosted.org) has closed shop, although some forks can still be found on github. Multiple workarounds are needed for modern features (e.g. HTTPS, encryption). Its main fork (jurko) is unmaintained for several years; a newer fork on github (suds-community) ports to Python3, but there are too few commits to fix all the bugs.