I'd vote for a really good bricks and mortar estate agent any day. I was tempted towards the online route, like anyone, to save money but when I sold my last house, I really saw a decent agent working to maximise the sale price.
If you live on a housing estate with dozens of recent comparables, then it may be all you need is a Rightmove ad via an online place, but my own experience was having my last house valued by 4 agents. Three were all pretty similar (and they were big names, Knight Frank, Savills, Strutt & Parker). The fourth came and explained things about my own house (owned for 4 years and totally renovated) that the others didn't see. They priced it almost a clear half mil more than the other agents.
I challenged them and signed the contract and agreed to 1% plus VAT. They sold it in four weeks (summer 2016). What I did experience them doing was positively marketing the property. They wore out shoe leather showing people around, they followed up calls almost every day. They created a market between three interested parties. They were professional sales and marketing people, not just call takers in shiny suits.
I wouldn't pay more than 1% plus VAT anywhere in the country. I agreed this fee but then paid for professional photography (£300) and brochures (£250) since the agent wouldn't agree to the no sale/no fee at 1% unless I put my foot forward in some of the non recoverable costs.
There is no way I would have had the courage to price the house out where it was so, for me, a decent agent worth their weight in Omegas.