Unity has come along way and is still making ground, but it's not on par with Unreal yet in its entirety. I also don't consider Unreal and Unity in the same class of engines in terms of out of the box features.

If you're considering a much bigger sales count of $30,000,000.00 USD, yes Unreal will cost you way more at $1,499,400.00 USD per year, but I doubt the OP will be bringing in those numbers, and my comment is geared towards beginners trying to sell their games, I doubt even sales of 3000 units for any unknown studio without a decent marketing budget and strategy in place would happen. Unreal would be your best choice in this scenario for a one or very small studio. Or with Unity Plus per seat each year is $395.00 USD, or Pro at $1500 USD per seat each year. Assuming a high 3000 unit sales per year at $4.99 is $3742.50 USD per quarter equaling $148.50 USD per year less the $3000. I personally look at this in terms of hobbyist sales. The price is cheaper when considering unit sales of average indie games. Also for a AAA game with a $10M budget, they'd probably end up paying at least $700k in licensing, which is crazy, so they'd definitely negotiate for a better deal than that. If you're planning on making a game that pays you a normal salary (not a hobby / free time game), this actually works out to cost you about double what a Unity pro subscription for each of your team members would.

Gamebryo engine startup video