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X4 - much better actually simulated economy, huge improvement in immersion and graphics, slower pace (especially building stations takes a LOT of time), shitty SETA that has to be crafted (bloody crafting/grind mechanics have to be in everything nowadays), enemy sectors completely unthreatening to player-driven ships thanks to travel drive, custom assembly of stations from modules. No, you cannot play X3TC story missions in X3AP.
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The difference between the two is that X3TC has some more storylines but X3AP has a bunch of gameplay additions. Btw you need X3: terran conflict to play Albion prelude. If money is a bigger issue then get X3, as the whole ideal X4 package requires both DLCs. Imo, if you only have time to play one and money isn't a large issue get X4.
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That said there are mods such as Litcube's Universe that makes X3 more complex, but you're going to need to understand the base game first. You hire crew in X4 and can see them in game. Furthermore, all your ships are piloted by AI (no crew) in X3. When you dock in X3 a docking arm connects you to the station and a UI pops up to do whatever and that's it.
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In X3 you can only space walk to get that scale. Then there's that whole immersion thing with being able to walk on space stations and bigger ships to get that sense of scale in X4. X3 just poofs their ships out of thin air. If you wanted to blockade a sector that contains a faction's shipyard, whereby the shipyard doesn't receive ship building materials, you'll eventually starve their merchant and war fleet in a war of attrition if you desire.
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