Howland Current Pump VS Wilson Current Mirror
The advantage of the Howland current source is that it can (1) both source and sink current (2) to (or from) a grounded load.  The caveat is that it needs good resistor matching.  See this Comprehensive app note on Howland current source and its variants.

Wilson current mirror can only sink current.  It's made with a few transistors.  Inside ICs, transistor matching is easier to achieve than with discrete transistors.

Sticking with OpAmps for simplicity is a good idea (unless circumstances dictate otherwise).  Besides, there are other OpAmp constant current sources and sinks that are simpler than Howland.