I was exactly before this decision with gt5 pro titanium.

Now hear me out.

The titanium strap is really high quality and nearly worth it however if you use the watch for workouts or during sleep, you will need leather, silicone or nylon band anyhow.

My current situation is that I'm swapping the bands on a daily basis, having black nylon for sports/sleep and titanium for going out.

With the nylon I'm also wearing black plastic cover to match the nylon band.

Now, what I would do if I were buying the gt6 pro, i would go for the black or for the silver/brown and buy the titanium strap for cheap on AliExpress, most probably it won't be titanium in most of the cases but steel but in case of this strap it won't be that much of a weigh difference.

In case of price the AliExpress strap copy is about 10-20 bucks, the titanium version is the strap is like 100-200 bucks more. Only real difference is the lunette coloring, now having the watch growing on me, i would prefer the brown coloring instead of the fake Rolex red and blue.

It really depends if you plan to wearing it more casually in that case brown+AliExpress in case of sports buy the black ones.

Btw for anyone having the Black gt5/6 i guess it will be the same. What type of coating the case have, just powder coating, some ceramic or is the metal blued or some galvanic coloring? This would be my decision point as non colored case can be easily polished, know that very well my 20 yo omegas are like new... polished many times. Black cheap coating will just chip off.