I don’t have experience with DeltaWASPS. Sorry.
I might be a bit of a Lulzbot fanboy, though. They’re under an hour from my house.
I routinely run multi-hour prints without problems. I haven’t really run anything longer than about 36 hours, though; I did run those 36-hour prints back to back for about 2 weeks without problems. I have recalibrated my extruder once since my initial calibration (I wanted to use a more accurate measuring device). I level the bed once after moving the printer, and set the z-stop when changing temperature profiles. Sometimes, after several prints (days to weeks), if I feel the bed may not be level (or I’ve removed and reinstalled it, or really whacked it around), I’ll level it again. Leveling takes about 5-10 minutes if you’re really picky about it (it’s good to be picky - those extra few minutes will save you hours of annoyance).
I just ran a couple of prints in PLA, one 20 hours and the other 28 hours, and didn’t have any heat creep issues or anything. The TAZ 5 (and the TAZ 6 when it comes out) has a Hexagon all-metal hot end with a fan on the heat break, which really took care of most of the heat creep issues people have had with PLA. I haven’t seen any symptoms of it since upgrading to that hot end. There are also plans online to print a heat break fan upgrade and put a fan on it with about 8 times the airflow, but I haven’t bothered yet as I don’t seem to need it.
I’m not sure why people have issues with the TAZ. It’s been a very reliable and fairly easy printer, and a workhorse. I run it with OctoPi, and routinely leave it unmonitored for hours and hours at a time (and into the night when I’m asleep). There’s a robust community of owners who share suggestions and upgrades (which are generally not needed), and Lulzbot itself published files for the printable parts, and upgrades.
I’ve printed on the TAZ with ABS, PLA, ColorFabb PHA, NinjaFlex, HIPS, ColorFabb XT-Copolyester, ColorFabb Bronzefill, ColorFabb Copperfill, ColorFabb Brassfill (tricky), ColorFabb nGen, ColorFabb Woodfill, ColorFabb Corkfill, and PET+. All have produced good results.
There’s definitely a learning curve to 3D printing, and the TAZ doesn’t really eliminate it. There are some printers that flatten it a little bit, but once you learn how to use your machine, many of them can be reliable. I also teach some intro-level 3D printing classes at the library here, using Lulzbot printers (TAZ and Mini).
I do have a Form 1+, also, and while it works fairly reliably (susceptible to dust, though), it’s quite messy, and you do have the potential resin toxicity. You can use the parts to make molds, though, and cast in safer materials. Which I haven’t done.
I’m curious to see which printer you’ll choose!