I think it depends on your needs. What are you going to use it for? Do you need a ph probe? How many things are you planning on controlling and monitoring? The nice thing about getting the JR is you can always add to it later if you need to. My set up is a JR with an EB8 and pm1.
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Yes I agree about it depends on your needs. But you also realize this hobby is like crack, most people what more. Kinda like let me start with a jbj Nano cube and after so many upgrades to a 150 gallon. Or I will never get into sps only softy tank...... man I have to dose my 150 gallon sps tank.
Apex is for back up and not just turn on and off lights. I turn off my doser in case my alk get stuck and ph goes sky high. Some people use 2 ph probe for cal reactor. The 0-10v can control pumps and LED. I add one module to control another tank but Apex jr can only add I think 7 module max. I have enough wires and plugs and prefer not to have so many modules and usb cords if I can help it.
But again it's what you need it for and I always plan for the future so I don't spend more.