Build front suspension before or after mounting the engine?

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I've read it's much easier to remove the suspension with the engine mounted, because the weight of the engine helps. Note: I've already removed the suspension, this is a ground up.

I figured the same logic applies to building the suspension, but I've seen a couple builds done without an engine. I can't drop the engine yet, so I'm wondering if it's just as well to build the suspension without it?

If I build the suspension first, you figure I need a coil compressor or will a floor jack suffice? Also, is there any reason to torque everything down after the engine is mounted? Doesn't seem so, but just asking. Thank you