It's a big crap-shoot when you send something to auction on any platform. Unless you want to sell it for domain investor pricing, you'll need to do your own marketing to end users.
I had a lot of success with an auction in 2008 at Sedo. I had a buyer contact me for WorldOfWellness(.)com and submit a $1,000 offer. I countered at $5,450, and then the buyer sent me their "final" offer of $1,500.
So I sent the domain to auction. Within a day or two, the auction received a second bid.
I then contacted about 10-20 companies that used this same term or very similar terms in their name or marketing taglines.
On the last day of the auction a new bidder joined and raised the bidding (along with the 2nd bidder) all the way up to $7,000. The first bidder never bid again after the domain hit $2,000. Had I not contacted 10-20 companies, the bidding probably would have ended at $2,000. So what you do in terms of marketing will make all the difference.
https://sedo.com/search/details/?language=us&aid=27005&language=us
Last year, when things were slow, I thought I'd replicated the same thing since it was "so easy" the first time I did it. I had recently acquired the domain kathmann(dot)com which was a family name and used as a company name as well.
I spent about 3-4 days of solid work reached out to over 100 people with the family name and already owned other domains as well as businesses with the same name, though most of the businesses were in countries where ".com" wasn't important to them.
For this auction, I paid $160 for the domain when I purchased it, and the auction ended at a low $100 minus fees to another domain investor. So I lost about $100 or more on the domain because it was before Sedo lowered their fees. (shows my 2nd account in the link below is in India, but I'm in the US)
https://sedo.com/search/details/?la...trackingOrigin=&aid=488951&origin=&language=e
So you can have great success or no success with an auction on any platform. No matter what, you should reach out to potential buyers once the auction is started (and preferably after there is one bid). In the case above, even if you spend a ton of time getting the right people to the auction, if luck isn't on your side, it may be fruitless no matter what you do. Because of this, I've just gone back to waiting for buyers to come to me rather than the other way around. It's too much time for me to waste on something that can't be replicated with a high degree of certainty.
The other problem with selling at auction is if a potential buyer is willing to pay $10,000 for a domain, by selling at an auction, you are potentially allowing them to buy for a huge discount. They now only need to pay $10 more than the highest losing bid which may be 1/10 of what they would pay.
If you proceed with an auction, I've also asked myself "which platform" many times. To me, from what is currently available, Sedo feels like the most professional experience for an end user. I say this because I believe you need to have an auction membership to participate at GoDaddy, and flippa has always felt really scammy to me. eBay is another option, but again I think the perception of not being a "professional" domain marketplace is a negative and eBay will not help you with the domain transfer, and you still need to worry about some type of escrow service and the communication of this process, so better to just avoid eBay.