On the DEC route, if the bridge to BSC fails when you transfer DEC to BSC, you can have your DEC blocked for a long time before they are returned to you. But I heard they work to improve the bridge (or maybe already did that).
There is also HivePay.io, another alternative for Hive-Engine deposits/withdrawals. Fee is 0.2%, but it suffers from the same liquidity issues for the SWAP.HIVE->Hive conversion as the others.
OK - Note to self: only transfer DEC in small quantities!