My opinion. If you were going to keep the Rega then go with the Benz. If you are planning on upgrading the Rega in the near future then go with the Dynavector.
Just my opinion and you have narrowed it down to two good choices.
Both are a good match (warning - dealer disclaimer - I sell both of these cartridges).
The 17d3 is a bit more robust down low than the Benz is however, and with the Rega's tendency to exaggerate this frequency band, you might find the Dyna/Rega combo to a bit be too much - even if you were to perform counterweight mods.
For this reason, I'd stay with the Glider/Artisan Tutti.
This is close, and if you did not have both cartridges to compare against, I doubt you'd care.
Thom @ Galibier
I'm going to bump and hijack this thread. I am having the same dilemma, both of these carts have great things said about them. I see above that my rega rb250 arm may be a better match with the Benz but I want to be sure since I really don't plan on buying anything else past this point.
My setup: funk firm turntable with rb250, dynavector p75mk2 preamplifier.
Current cart is a denon dl-160 and I like it but would like to explore the higher ranges.