I've signed both, however I lean towards the non-exclusive more these days. Many of these libraries have thousands of tracks, some like DSM Producers have hundreds of thousands. Easy for your tracks to get buried in bulk.

However; I still sign exclusive agreements with the ones that have already placed my tracks. They have a proven record.

And yes, I still consider both agreements, if they show promise, or come with a "good faith" royalty advance.

Best, John smile