In my opinion, I think both are good networks, have their own blockchain and have the potential to grow the network in the future. There have been many successful projects developed on these 2 platforms. For me, I like Polygon a little bit, I used ETH and BSC networks so using Polygon is quite easy, I can even integrate those 3 networks in 1 wallet address. For Solana, the usage is a bit different, so it takes time for newbies to understand.