In terms of usage, TVL, NFT volume, developer community, and many other metrics, Ethereum is still by far the leading blockchain for smart contracts, tokens, and NFT projects. The network is often congested due to its own success, causing high gas fees. The transaction confirmation speed and energy consumption are other drawbacks of PoW blockchains.
Despite Ethereum 2.0 (The Merge) possibly improving transaction throughput and energy consumption, gas fees will not decrease.
In the long run, it is expected to merge with Ethereum (become a shard) due to its support from the Ethereum grassroots community. Polygon features a PoS blockchain with high transaction throughput, extremely low transaction fees, and a low carbon footprint. Due to its EVM compatibility also inherits many Ethereum features, such as wallets, smart contracts, etc.
A great aspect of Polygon is that they fund and support hundreds of projects through events, hackathons, dev support, grants, and other means. Making it perfect for startups.
Despite many NFT projects launched on the chain and Polygon's strongest supporters, Polygon only has a low volume on NFT markets so far, making it a great option for the Continuum platform.