Trying to decide between the 2027 Merida Reacto 6000 vs Reacto 8000 and would appreciate opinions from people who have experience with Shimano 105 Di2 vs Ultegra Di2 bikes.

The price difference where I am is about S$1k (~US$780).

From what I can tell, both bikes share the exact same:

Reacto CF3 V frame

Fork

Geometry

Carbon aero platform

Main differences seem to be:

Reacto 6000:

Full Shimano 105 Di2

Vision SC60 carbon wheels

Merida integrated cockpit

Continental Grand Prix TR tyres

Reacto 8000:

Full Shimano Ultegra Di2

Reynolds AR60 wheels

Vision Metron 5D ACR EVO cockpit

GP5000S TR tyres

Slightly higher-end finishing kit overall

So essentially:

Same frame

Same aero platform

Same wheel depth

Mostly component upgrades

For riders who have owned or ridden similar-level bikes:

Is Ultegra Di2 actually noticeably better than 105 Di2 in real-world riding?

Is the Vision Metron cockpit a meaningful upgrade or mostly aesthetics?

Which wheelset would you rather have?

Would you save the money…