Agreed on the 'if you want to tweak etc'.. then yeah.. get something that can be upgraded to high heaven lol.
My kit so far is:
1) Creality Ender 3 V2 > This is highly modified for extra height / linear rails (including bed) / Belt driven Z axis to remove wobbling from Z screws / Microswiss Direct Drive extruder with 0.6 hardened nozzle for printing exclusively PETG Carbon Fiber parts.
2) FLSUN QQ-S Pro > HIGHLY modified bat **** crazy build that I only now use exclusively for printing TPU parts now, as I cannot trust its dimensional accuracy no matter how I calibrate it. (no fault of the mods, it was always that way
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3) FLSUN V400 > Stock machine with hardened nozzle (just cos), with the additional side panels to keep in heat. (Oh I forgot.. I swapped the metal plate to a metal plate + magnetic pad, and a glass bed glued to the metal plate, so I can have a removable glass bed, and a better quality bottom with more reliable grip to the surface.
The V400 is my main PETG production printer that I use for paintball magazines that are very tall and narrow, and big box magazines at present. I'm extremely happy with the quality. Maybe not a beginner printer due to needing to keep an eye on the belts and keep them 'tuned' but it is excellent.
The QQ-S Pro I could never recommend as the linear rods are simply not stiff enough to guarantee accuracy under fast movement. Better to get the Q5 that is smaller but cheaper and more rigid.
The Ender I only keep now for PETG CF... and I regret some of the upgrades I did. I will eventually convert it to a Core XY machine, but it was my first printer, and the one I loved and hated at the same time. I got some exceptional quality at one point, before I moved to linear rails lol. I HIGHLY recommend getting yellow bed springs and the creality levelling prove for any ender machine. Takes so much of the frustration away.
Oh lastly... BUY A FOOD DEHYDRATOR. Having moist filament ruins your prints.
Oh and second lastly lol... if you have any issues with filament... I highly recommend Vision Miner Nano Adhesive... incredible adhesive and lasts quite a while. I tried so many adhesives, but this was the absolute best. I use it with almost every print.