here’s my opinion:
-reprap variant if you like trial-error troubleshoot problems, it will work like a charm after you learn all tidbits, check on rostock variant
-makerbot if you just something ready to use ( the price is higher compare to other ready to use “homemade” FDM printer)
- go with form1 if you want high-res quality part, its the best for its price (but currently they’re been sued by 3dsystem)