Litecoin, Dogecoin, etc. are designed to support faster transaction times than Bitcoin. However, I acknowledge that they aren't relevant to this page because:
- The centralization of hashing power in China is an issue for many cryptocurrencies (especially Litecoin), not just Bitcoin. This may not be the case for Gridcoin, which is mined in association with the credit system of existing BOINC projects, but Gridcoin isn't anywhere near popular enough.
- Bitcoin will always be more popular (well-known) just because it came first. This is the whole reason the term "altcoin" exists.