They are both amazing and can even be stacked together. Personally, if I had to chose 1, I would go with GW. It is just easier being a 24 hour half life, and also I have had great results from it in the past.
The taste and colour really come down to the other things in the bottle besides the active ingredient. No need to worry about it. Umbrella is the best!
I wouldn't be overly concerned about cortisol unless it becomes a trend. This is the first time you have had it tested so just make sure to include it going forward.
Good updates man. I wouldn't even bother measuring or caring about 1lb either way. You can gain/lose more than that with just water retention. Don't beat yourself up on those numbers.