First thing: you have to decide if you want to go with our without front derailleur. The common style for road bike is with front derailleur, which gives you a large range of gears with small steps in-between the gears.
Second: without any judgment on quality and reliability, Sensah, Ltwoo and Shimano follow very different styles of shifting.
Sensah is equal to Sram. Only one lever does the shifting in both directions.
Shimano uses two levers. One for up, the other one for down.
Ltwoo uses one lever and one thumb shifter like Campagnolo does.
You see.. your choice influences not only the spent money.
I'm used to riding fixed gear in 52/17 everywhere I go, not up many hills but up some hills non the less. I think I would be fine with a 1x drive chain with no front derailleur. I also like the idea of building a lightish bike.
Regarding the shifting style, I've never experienced any of them before so they would all be new to me.
Is the L-Twoo R9 11spd groupset really so bad?
I'm ok with hunting down shimano parts on ebay and facebook marketplace, but I'm also a big fan of buying cheap things that do the job from Ali