Magic happened, Bitcoin Cash arrived, and now I want to invest - but I need a wallet.

Without downloading the blockchain onto my pc, since I literally have no space for that.

Bitcoin Cash's website, recommends these:
- BitcoinABC
- BitcoinClassic
- BitcoinUnlimited
- BitcoinXT
- ElectronCash
BTC.com, Ledger & Trezor - Ledger, Trezor and BTC.com is not an option.

A second question...
1. What is the difference between exchange buy/sell and margin buy/sell - and what exchange, would you recommend for trading?

Thanks!