How much data you get, and if it ever gets slowed down, is an important factor in picking a plan.
Data
Verizon’s Unlimited Plus gives you unlimited premium data, so you'll never get deprioritized no matter how much data you use. Xfinity’s Unlimited Premium has unlimited data, but you can still get slowed down.
While data, hotspot, and perks are important, how much a plan costs is the most important factor.
Price
Xfinity’s Unlimited Premium wins when it comes to price, with one line coming to $65/mo. Verizon’s Unlimited Plus comes at a much higher price, with one line coming it at $80/mo.