That HP Cutter is pretty much 99% Summa. It's made by Summa, parts from Summa, only firmware says it's "HP cutter" and they wanted a network port on it which didn't exist before on D140.
I think today Summa and HP even have the same part numbers on both of their inventory.
But if you would get a Summa, definitely upgrade to S2.
And yes, get a machine that has a mark detection. You do print&cut, you 100% need it.
I would not touch that US cutter...
The HP cutter is a Summacut and the HP plus is a Summa S-One.
HP uses a special barcode with the SAI Software, which is pretty user friendly und when you need a printer, cutter and software; the price is nice.
As far as i can judge, it should be possible to "un-HP" a HP, or HP a Summa via Servicemode.(Funktion to set brand and type of cutter, used when a new mainboard
My ranking in cutters (sold them all)
Summa S2, S-one, Summacut are nicely built with very easy to use advanced functions and the best cutting quality in the market. (Summa Cutting Software(Winplot) could be better, the new Gosign is a step in the right direction)
Mimaki has a good cutting quality with lots of good funktions. Mimaki bundles their cutters with the best Pluginsoftware (Finecut) by far. It's very easy to print/cut with any printer and Rip. Adobe plugins lag behind about 6 months.
Graphtec has good cutting quality, but much too many menu settings in a unbelievably unlogical menu structure. They supplied a pretty nice Software/Plugin (Cutting Studio/Master) for a while(you could access the important settings, without fiddling on the cutter menu) now, they supply a SAI Flexi which has limited access to the cutters menu settings.
Roland doesn't reach the cutting quality of the others IMHO. The software is soso. I'm very fond of Roland printers and install them since more than 20 years. I installed the first Roland cutter in 93...
I have limited experience with GCC and some chinese cutters. While GCC isn't bad, i would not touch the nonames.