DC 2-Unit Question - Investor Deal

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Hi - first time poster, long time reader. I'm selling our partial house-hacked 2unit in Washington DC (fully permitted basement) to move to a cheaper location and reinvest the proceeds. We've lived in 2/3 of the house and rented the basement for 5 years.  An investor approached me yesterday with an offer and now I'm trying to decide if its better to take the offer or chance it on the market.  I think the offer is competitive with the market (albeit perhaps on the low end) when backing out agent fees and marketing costs.  However, given the low inventory, I'm wondering how others evaluate opportunities like these?  The way I see it -- I have a "deal in hand" vs. the prospect of a potential better deal in a few weeks. ---- Thanks, Alex