Sport, data is running exactly the same job on both machines, over and over again varying the jobs, and actually measuring the outcomes and differences. Not spec sheets, not opinions, not anecdotes, data.
How about you, have you run the same cut job on both machines over and over? If not than them being equal is also just your opinion.
They use different parts, different technologies... Unless everything is 100% the same, one HAS to be better than the other. Either marginally, or by a long shot.
The Tangential is beneficial in a lot of ways. It cuts not only magnetic better... But diamond grade, egp, high intensity....even paint mask better.
The Barcode and roll to roll option in the summa is also a great benefit. I used to do rolls of decals per month... Having it automatically cut the whole roll would save hours upon hours.. Why graphtec hasn't added roll to roll is beyond me.
That said... Summa touts how they're better for perf cut because you don't need to switch the pen to a second slot. I've done about 40,000 perf cuts in one month and never needed to change the cut strip. I can't imagine doing that volume on the summa without messing up the strip.
I believe summa even states their flexcut us for straight cuts only. On my graphtec I've cut tons of ovals and circles with no issues.
They both have their advantages and disadvantages. Saying they're both 100% equal is ludicrous. If all your doing is cutting shop hours for your local mom and pop stores, sure.... They're equal.
But if you truly think they're equal in every way... Youre not using them to their full potential.