Both are secured and the only significant difference is its design and price, so in the end it depends in your personal preference.

As for the alts, Both wallets supports it but not all of them so if you have a specific coin that you want, you might wanna take a look at this:

Trezor: https://doc.satoshilabs.com/trezor-faq/overview.html#which-coins-are-currently-supported
Ledger: https://ledger.zendesk.com/hc/en-us/articles/115005304449-Which-altcoins-and-tokens-are-supported-by-the-Ledger-products-

It's a shame that you missed the black friday sale. Both ledger and trezor wallets are discounted that time. It ended I think in Nov. 27???