The 46 ring is about a half shift easier than the 50 ring. Either one will work.
With the 11-32 11-speed cassette, either one has reasonably close shifts on the big ring. The 46 ring is a little better in the 10-18 mph range, but it's not a huge difference.
With an 11-28, the 46 ring has somewhat closer shifts in the 20-25 mph range, helpful if you are riding all-out to keep up with a group going over 20 mph at times.
Here's a chart of 34(red), 46(black), and 50(blue) chainrings and 11-32 cassette at typical flat road cadences. You can see the offset between 46 and 50. From Mike Sherman's Gear Calculator -- here's a
link to these gears.