Yes you can hold both but other than a welcome bonus not sure why you would.
Venture One - $0 AF earns 1.25 miles per $
Venture - $95 AF earns 2 miles per $, has GE/TSA credit
VentureX - $395 AF ($300 credit in Cap1 portal and 10k miles 2 months after anniversary makes AF -$5) earns 2 miles per $, has GE/TSA credit, Lounge access through Priority Pass and Cap1 lounges.
The savor card earns the 3% for dining, entertainment and groceries but the points are cash. You can not use them for transfers to travel partners unless you first transfer them to a Venture card first.
Since you have had your current venture for only 6 months I would not do anything for another 6 months as it’s best to hold the card for at least a year.
I would apply for the X and hopefully you are approved. Afterwards you should in 6 months then “upgrade” to the savor that has $0 AF and then you would have a 2% card for everything else and 3% for dining, entertainment and groceries in the savor card that you can then transfer to the X.