Both Trezor and ledger are connecting in the similar way with usb connection and I would say that risks are equal here and most mistakes happen because of human mistakes.

2.What will happen if I have etc. Trezor and it get broken/lost/malfunctioned-can I still retrieve coins if that happens?
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You can always recover your funds if you stored your backup seed phrase in safe place, and import them in other hardware or software wallets.

3.Can I get hacked if I connect them to infected PC or PC with bad Antivirus protection?
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Hardware devices are created with assumption that computer device is infected so it should not affect your coins on hardware device, but some keylogger may be used to record what you type.

4.If either company (Trezor/Ledger) goes broke,what will happen with support and will i still be able to use them?
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Your backup phrase and private keys are more important than any hardware wallet device, and if or when some company close down just use your seed phrase and import in other wallets.

5.I prefer to be more safe once I'm connected to PC and I have less worries that someone will steal physical device,which one would you recommend then?
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If you want to be more secure than use separate computer only for connecting with your hardware wallet, and keep you hardware wallet in safe place.
Using passphrase as 25th word will also help in case someone stole your hardware wallet device.

6.Which one has larger capacity for storing more coins?
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ledger nano s have limited memory capacity and you can only install few apps to fill this memory space, nano x has bigger memory space, and there are no limits or apps for trezor wallet.
Trezor have advantage here and support for coins is very similar for both but you can check exact coins on their website.

7Which one is more future proof in long terms?
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Long term my bet is on Trezor because they are fully open source, they are working on their own secure element and they care more about customer privacy and keeping information safe.
They are also first ever hardware wallet created, and they contributed a lot to crypto ecosystem with real development solutions.