I think polygon (matic) is the best option now. They have already release their own network with high transactions per day which mean lots of people going to focus on this network. The current price is still cheap, but i think you should wait for better price or just split yours investment. This year will be big for polygon, so buy some and wait for the next altcoins season. 
Many people do suggest polygon for investment because the coin has the potential to grow in the future, so I think there is nothing wrong with trying to invest in polygon,
looks like this coin is going to get big and it might just be a matter of time