If you don't have a personal favorite, which I'm sure most of us do...I'd suggest hitting up http://www.av-comparatives.org/
Keep in mind however that this is a suggestion...Malware changes daily, and just because a report from four months ago show's one product on top, it doesn't mean that it is so today.
To provide an even better suggestion to my customers I will take some of the most common Infection types, and toss them at https://www.virustotal.com/en/
If your suggested AV tool doesn't detect the infection, well then I think twice about making the recommendation.
I would suggest Malwarebytes Anti-Malware (You can't beat it, a few $$, one time purchase, life-time subscription), SpywareBlaster (Now for Chrome, Firefox, etc.), and Bitdefender (based on current reviews and research)
Some other highly recommended AV tools: ESET, Avast, and Kaspersky
There is a whole slew of Malware Removal apps out there these days. The above is what I use.
I use them because:
1. They take up a small footprint, and have kept more malware off of systems than anything I've tested to date
2. They are all free, and often times when used together will beat out any paid for product (kinda sad but true)
3. They are very easy to configure. SpywareBlaster and Malwarebytes are both run on demand apps, so you will need to update them manually or find your own way to schedule updates (very unlikely in the case of SpywareBlaster, as this is about the only thing the Pro version is good for). Bitdefender Free is a cloud based app, and is the lightest weight thing I have seen since Immunet's cloud app. It takes virtually no configuration, and is easy for Grandma, and Grandpa to work with because it does everything in the background for you.
I'm interested to hear other's opinions on how they find a reliable way to recommend AV tools to their customers, or their reviews on current apps out there today.