HiveEngine is deprecated.
TribalDex is the official site IIRC.
Also I need to point out that liquidity on the orderbooks is typically quite bad except in the case of Splinterlands assets. Most of the time it's smarter to use the AMM swap feature as the liquidity pools are much deeper. Then again the only tokens I've bought are LEO & ZING so I can't speak to other projects.
RE: Is there a better trading interface to the Layer 2 Hive tokens than Hive-Engine?