You could also look at the voron 0.2. It is small, but could also be used to print parts to upgrade your ender to a voron switchwire. They have the ability to be enclosed, heated, and print stupid fast
So the ender 3 and the pursa share the same design lineage from the i3 pursa system. It's just Creality made them dirt cheap with some engineering decisions. Functionally, they are identical (sliding bed), and therefore have the same problems with high moving mass when pushing the printer to high flow rates. In addition, you also saw a wider extruder system will cut down on x and y axis space.
Instead of buying a whole new printer, you can just buy the sprite system separately (Creality does sell it separately). It will be compatible. In fact, ender 3 will remain an excellent printer for out of the box upgrades due to community and after market support.
I am already running the sprite.
Prusa is a good, reliable printer which hasn't improved in a while. It's basically two decade old technology. If you're really interested in upgrading, hold out for a little more and get a p1p. It's fast and reliable. Replacement parts are cheap and available. Even clone parts are now available.
https://store.bambulab.com/products/p1p?skr=yes
An alternative would be one of the corexy enders (5+?) and upgrade it. These can be had refurbished around $300-ish. Okay platform for upgrades. Prints okay out of the box.
You didn't really say what your expectations are or what you're looking to get on the other side of a purchase. If you want an actual upgrade you'll likely want something which prints faster or is enclosed and can print more materials reliably. If you want both, that pretty much means a corexy of some type.
All printers require maintenance. Nozzles wear out. Heat cartridges and wiring fail. So on and so on.
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