August, September, October is best time for lake matron for flamingoes
We visited Lake Natron in early June of this year. We had an incredible experience that I'm thankful for but it wasn't so much about the lake. For us driving up from Tarangire National Park it was a really long, dusty, bumpy ride. We did see flamingoes at the lake and I guess being June there weren't as many as I expected. I probably wouldn't go out of my way to visit this lake.
It depends on the purpose of your visit.
Natron is very harsh but scenic. Cloe to Maasai Mountain of god. Ol Donyo Lengai which is an active volcano.
Baringo and Bogaria and also scenic but are visted for mainly birding.
Naivasha can be a bit touristy but has excellent birding and mammals plus activities.
If you have the time then visit. You can always leave early if not impressed.