My 2c as both a Suunto and Shearwater user (Eon Steel and Perdix AI)
Main difference between Teric and D5 is cost, and the difference is significant.
The Teric does have a clearer screen. But the D5 is more customisable
Fused RGBM2 apparently has some improvements on the Old Fused RGBM as use on my Eon. But I know from many 100's of dives that Buhlmann and fused RGBM are almost identical in their NDL and Deco stop times (p-2 and 45/95) is teh sweet spot I've found)
I personally prefer the Suunto way of screen customisation where you have different pages set you your needs that make certain data more prominent on different pages - depending on you needs at different stages of the dive
Both Suunto and Shearwater have their good points and bad points but IMO from a functionality standpoint both equal
In US certainly Shearwater has good customer service reputation, those advantages are reduced outside US/Can. My Eon had a depth sensor go south, it was fixed at my local dealer within a week, I know 4 other Eon users that have computers of similar age, and similar usage that haven't had an issue
Some minor details between them such as charging etc might swing you one way or the other
My dives are to a max of 50m , generally around the 60 min mark, we dive in blue water on DPV the profiles might seem aggressive to some, but neither computers have cause me issues (no lock outs on suunto) and although on balance from usage I prefer my Suunto over the Perdix thats down to personal preferences rather that a technical detail weighting the decision