It’s hard to give someone a blanket recommendation on what is the best model tank kit, since everyone has different interests…
For example, while most modelers may prefer a 1/35 kit, some people could find more enjoyment in building a 1/48 model tank. Also, everyone likes different subjects. Some folks may prefer focusing on the WW2 era (i.e. American Sherman tank or German Tiger tank) versus the WW1 era (i.e. British Mark IV tank).
In this post, I consolidated some of the best model tank kits that have been released over the years, and categorized them by (1) brand and (2) scale.
While everyone has different personal preferences, my hope is that as you go through the list, you find a model tank kit that catches your eye, and truly gets you excited about building it!