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> important to me and is cheaper
Only $11
As for alt-coins, yeah, if you have a non-trivial coin on Ledger that isn’t on Trezor, go with Ledger. Better to poorly secure your main coins than leave them unsecure in a SW wallet because you don’t have HW support.
For the „why Trezor“. Mostly what you said already. Open Source, Reproducible Builds. Better documentation.
And for „why Ledger“. Specific alt-coin, iPhone, promo-code