Mooer Micro ABY Box MKII

It's small and can work in both directions as a signal splitter if you for example would like to use 2 dirrefent amps, but also the ability to switch between two effects without unnecessary clicking on each of them - one to turn on, the other to turn off.
It's hard to say whether it has any effect on the sound, because I tested both ways and didn't notice any difference.
Pros:
+ small
+ easy to use
+ simple build (one switch for switch/split mode and one button)
+ it can work as a splitter without connecting it to the power supply
+ very good price for good quality
Cons:
- VERY bright LED especially pink/violet one - I had to cover the LED with darker tape to reduce amount of light