Do you mean that it has no secure chip? So you can attack with glitching and read out the seed?
Yeah... otherwise, they're both very good devices for someone who just needs a "basic" hardware wallet to store a couple of different coins and doesn't want to spend huge amounts of money. They are kind of like the Toyota Corolla of hardware wallets, just reliable devices that get the job done without being too flashy or expensive.
Like I said, they're both very very similar, and I'd probably pick the Trezor if my use case was slightly different. For instance, if I was a regular trader that used multiple different coins then swapping the coin apps on the Ledger would probably get annoying after a while... but I have don't really use altcoins that often, and I can fit all the coin apps I need on the device.
I know a lot of people have had issues with the Ledger Nano X, and they had the data leak (which thankfully didn't really affect me), but my Nano S has been a solid little device that gets the job done. It's just a shame that Ledger shot themselves in both feet with a lot of their business decisions and communications (or lack thereof).