I suggest you consider this question: Is the commission rate more important than the dollar amount you net at closing?
It's the net amount.
So the question I would ask is this:
How can I make sure that I net the highest dollar amount possible when I sell my home?
That question opens up a lot of territory that will help you grasp the issues at hand.
OTOH, let's talk about reduced commission rates. Most markets are buyer's markets, so you are probably is. If the buyer that first sees the home they buy sees it with a Realtor, you probably want to offer at least "market rate" commission to the selling office.
So you could list with an MLS entry only broker, or a discount broker. In my MLS (and no offense intended to anyone...these are just the stats), they have three important characteristics
1. The list price versus sale price ratio is 2.6% - 4.5% LOWER than the average
2. Their listings FAIL TO SELL 50% more often than the average
3. Their listings take longer to sell, when they do sell
So unless you've got money to burn and time to kill, I would interview three Realtors. Ask them to prepare an Estimate of Seller's Net Proceeds. Know that homes that sell in the first 30 days sell at closest to asking price. So a home needs to receive at least ten showings or two offers in the first two weeks, or a price adjustment is in order. If the buyer is brought by a Realtor 90% of the time, Realtors know values, and buyers are looking for good values.
Assuming your market is average, price slightly below market. The market will not let your home sell under market value.