It's the same restaurant. Just different perceptions. An agent might use a high listing price to secure a contract, only to seek a lower price later, after little traffic is generated at the initial price level. Check on experience, education and productivity. As with most professions, experience pays in real estate.
Experienced agents know the market and the marketing process.
They'll have the best chance of quickly and smoothly helping you to buy or sell your home. The number of transactions an agent is handling monthly or yearly is going to give you an indication of how committed the agent is to the profession. More and more buyers are deciding they want full contractual representation on the same level as the seller. Be sure to discuss buyer agency with any agent you're thinking about working with. This can be especially important if you're selling in one city in preparation of moving to another.