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If you, for whatever reason, absolutely must use single key paper wallets, then the only site I'd even think about using is https://bitaddress.org/ or maybe even better, getting the website code from its github repo: https://github.com/pointbiz/bitaddress.org so you can see that it hasn't been altered in 6 years.
Btw, the only legitimate source for Electrum is https://electrum.org. You can of course use any offline system, also for example running from a Ubuntu live-usb.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.