Mainly the fact that things in FEH aren't nearly as expensive as in Pocket Camp.
I mean, the latter got stuff that requires you to spend dozens of Leaf Tickets just for a single thing while a summoning round in FEH takes 20 Orbs at most.
The best example of this is when you try to expand.
In FEH, you need a single Orb to have 5 more spots in your barracks, allowing you to hold 5 more units. You can do this a grand total of 160 times to boost your barracks to the limit of 1100. That's 160 Orbs.
In Pocket Camp, you need 80 Leaf Tickets for the ability to craft one more thing at the same time, and can only do it twice. 160 Leaf Tickets.
Both end up having the same value, but FEH is way more profitable, nearly quadrupling the maximum amount of units you can have, while Pocket Camp just lets you craft two more things. Both are arguably equally useful, but FEH gives you a lot of control by making it relatively cheaper and more controllable due to being able to raise your cap by increments of 5, thus also making it more affordable.