Wirecutter

If you don’t mind a corded tool, the Wahl Peanut 8655 has cutting power that no cordless trimmer can match, with a durable, easy-to-maintain design.

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TechGearLab

The Wahl Lithium Ion All-in-One Grooming Kit is a step up in quality from the Wahl Groomsman. The primary difference is that this model has a rechargeable lithium-ion battery, whereas the Groomsman requires the use of AAs. Our testers enjoyed the feel and ergonomics of the rubberized handle and found the blades to cut exceptionally well. 
Designed with facial and body hair in mind, this trimmer doesn't come with longer blade attachments for anything but the shortest of haircuts. If you want a trimmer for your face and head, you might want to consider some of the other options, but this product is hard to beat as far as having a dedicated beard trimmer. 

Budget Pick

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amazon.ae

The cordless MG7750 has a friendly design, lots of useful accessories, and just the right amount of power needed for comfortable, precise grooming.

The Philips Norelco Multigroom 7000 trimmer is truly an all-in-one device. Equipped with 23 different attachments, it's capable of meeting all your grooming needs. This handy device can trim your facial and body hair as well as perform full-on haircuts. It was unquestionably the most versatile device we tested. With an incredibly long-lasting battery and high-quality blades, there isn't much to complain about with this trimmer. The stainless steel handle is ergonomic to hold and has a hefty weight that gives it the satisfying feel of a well-made tool.
Our main gripe with this model is that it's not fully waterproof, leaving you out of luck if you like to shave in the shower. This caveat aside, we think the Multigroom 7000 is the perfect device for people looking for one tool to tackle all their grooming needs.  

Trimmer Comparison