I personally prefer the Ledger Nano S due to it's simple USB flash drive design. If I were to have huge investments in cryptocurrency I'd want it to be stored on a device that doesn't look like something that holds great value; hence I love that it's sort of somewhat masqueraded as a typical USB flash drive. I personally don't like the Trezor due to it looking too sort of "gimmicky".
That's a really good point.
I got a Trezor primarily due to shipping time difference, was months for Ledger Nano.
While Ledger Nano does support some more coins, I personally don't use many other than btc/eth/erc so it's fine
An important 'selling point' for Trezor, I think is that it's open source, which means people can verify that nothing suspicious is going on.
Sure it's probably possible somehow to backdoor Trezor, but still, who knows if Ledger Nano team has an 'Exit Button' that sends everyones funds to them!