I've been using iNat and iRec but noticed that not many of my iNat records get verified in iRec despite having all the right settings, so I've now switched to iRec. Just wondered - is it a more onerous task for verifiers to verify an iNat sourced record than one input directly to iRec ?

Theoretically the same. But the process of passing the data from iNat to iRecord sometimes messes things up so directly entering on iRecord seems a better option.

Exactly the same verification process. It may be down to whether there are verifiers for the relevant region/order. But unverified records will still get pulled through to NBN, albeit marked as unconfirmed, which is why I make a point of clearing my queue regularly [VC55 Moths].