Guys sorry to ask a newb question, but is there a secure wallet that can hold majority of coins?

If not, can I ask the reason why? I would be happy to pay $5 a month for a decent wallet that could do this.

Also whats the deal with syncing wallets. I have heard this can take DAYS nevermind hours!

To be honest with all the annoyances with wallets sometimes i feel its easier to just keep coins on the exchanges even know there's a risk of being hacked