haven't used passport, but for a signing device I prefer nothing hot, so the app is a negative imo.
Seed Signer is simple, but will not have a nice UI like a phone app would.
Discussion
I'm thinking now that I don't even need a signing device. I'll just send sats from river to the same address for now. I don't plan on sending sats off the wallet for a long time. If the time comes...the available devices will be worlds ahead of these two. It will most likely be integrated into my brain stem. #bitcoin
I'd recommend NOT sending to the same address, but using a new address to receive each time within the same wallet.
here's an article in Bitcoin Magazine about it.
https://bitcoinmagazine.com/technical/for-better-security-do-not-reuse-bitcoin-addresses
