Originally, I only intended to use Trezor as it has the most user and the most open-source nature. I came across various user reviews of hardware wallets on the website https://www.trustpilot.com/review/  and found that Trezor had the most stolen customers (= 12). Although it is widely believed that user responsibility led to these thefts, but a single mistake could wipe me out. So I chose diversifying my altcoins in 3 hardware wallets.