If you want to use 2 different versions of TurboTax for you and your spouse, then you will need to prepare your returns separately.

"Basic" is not available in TurboTax Online, it is only available in CD/Download form (for Windows).

Thank you,
If we file separately, is there any downside?

The downside is that the program can't see your spouse's information. You'll have to manually enter your wife's info, and she will have to enter yours. You'll also have to figure out yourself who claims things like donations, medical expenses, etc...

My wife does not have T4/income where I have.  Can I go with TurboTax Online - Deluxe where her with free? Thanks

@Prairie_Storm If you are preparing a joint return with your spouse, it will charge you for Deluxe Online version for both returns , as you will be using the same product to prepare & file the return. If you wish to use a Free Online version, you need to prepare a separate return for your spouse not a joint return.