Welcome!
First, this forum is for people who are using the Samsung SmartThings ™ home automation platform, so all of the questions and answers are assumed to be in that context. It’s a very active forum, so it often comes up near the top in Google searches, but it is not a general home automation forum.
It sounds like you are not using the Samsung system, so you might want to take your question to the Reddit home automation subforum, which is brand agnostic, and you should get a lot of good suggestions there.
Also make sure you tell them what country you are in, because the device selection does vary. 
The selection of any given device depends on a whole bunch of individual factors, so it’s not that there’s any one “best.“ The country you live in, your budget, the devices you already have, whether you are willing to have one or more hubs, all that factors into it. And the switch that might be best for someone using the Samsung SmartThings platform Will likely be different than the best for someone who is using a different platform, including just echo.
Also, you should be aware that anytime you have two switches that control the same light fixture (called a three-way set up in the US, or a two-way set up in the UK), you will probably have to change both of the switches in order to get smart control over them. There are a few models where that’s not necessary, but in general the wiring for smart switches is a bit different than the wiring for dumb switches in this kind of set up because a smart switch has to always have some current so that the radio can hear the next “on“ command.
But the fact is, for any of these questions, the first rule of home automation applies: “the model number matters.“ Different devices will be able to do different things even in the same setup. That may explain some of the different advice you have seen in different articles.
