What IYO does IV do better than V?

[Drakarska]

There's a few mods that have a higher setting then Agg Ai, which makes Diplo and trading rather interesting. ROM AND 2 ( or RAND2) and C2C immediately come to mind.
I actually like playing with RB checked, and while I realize a lot of Peeps don't play with Epic speed or higher, it's a really fun way to see what happens on a 26 Civ+ Giant map. The carnage is glorius to behold, and new Civs spawn at really inconvenient locations.
Oh, and just for your amusement value, depending on Mod you play, Barbs can go above rifles, AND have a nasty habit of doing amphib ops when your attention is diverted elsewhere.

 

[gavenkoa]

Epic speed or higher

I also enjoyed Epic / Marathon because it allowed me to build army that isn't obsolete till it arrived at rival border.

But with increasing of difficulty level (Emperor/Immortal) AI has money reward and can easily pay for army upgrade. So if you aren't tech lead you will face tons of comparable units to deal with.

So I started playing on Normal with planing of invasion in advance. That way your units aren't obsolete while marching across rivals territory.

Another game changing thing - heavy use of rally points: left click on city icon and then Shift+right click on rally point (sometimes with Ctrl is rally in city). With Alt+left click it is possible to select every city on continent. It is extreme time saving.