If the pain lands had basic land types or the shock lands did not then there would be basically nothing to chose between these two cycles of dual lands
If you run a host of enchantment and artifact destruction but few answers to fliers, then you know you have little chance of outright destroying a flyer with a single card
10 King Candy - Sugar Rush Nightmare 23/204 EN.8, Ruby/Amber Dual-Ink When Disney Lorcana: Reign of Jafar releases, many players may have to take a second look at the notable Racer cards from Wreck-it Ralph
And yes, they gain life
Bleeding your own forces a little on each players turn will very quickly add up to a lot of counters on your Incubators or on anything else, be that +1/+1 counters on your own creatures, -1/-1 counters on opposing ones, loyalty counters on your planeswalkers or even poison counters on your opponents
Both reward you for enchantments, but they trigger differently, and knowing which is which lets you build correctly