XT: One of mountain biking’s most popular groupsets, XT is commonly thought to offer all the performance of the top-tier XTR version, but with a price that’s far more palatable.Current generation Zee is a 1x10 drivetrain, it's now a little dated compared to current SLX and so has lost popularity, although its brakes are still commonly found on bikes that require great stopping power.
Zee: Designed specifically for downhill and freeriding, Zee sits at a similar price to SLX. In a ‘1x’ setup (one chainring), the most popular cassette choice is a 11-42T ratio. Current generation SLX offers 11-speed shifting at the rear, with a choice of one, two or three chainrings on the front. This is often due to the greater use of steels instead of advanced alloys. It’s the workhorse groupset that shares many of the same features and performance as models above, but with a higher weight. SLX: SLX is arguably to mountain biking as what 105 is to road cycling. Deore is Shimano’s first groupset to offer a clutch-equipped rear derailleur. Some bike brands do equip Deore on bikes with a single chainring, but Shimano themselves don’t offer the groupset in such a setup. Deore currently has 10 cogs on the cassette, and a choice of two or three gears at the front. 
Deore is durable, reliable and features much of the technology found on the more expensive SLX and XT.
Deore: Deore is aimed at the entry to intermediate level mountain biker and is perhaps the most popular too. Greater rust resistance and more easily serviced components are seen at this level. This groupset is found on entry-level mountain bikes that are designed for off-road use, however, the 3x9 gearing and lack of a clutch-equipped derailleur are the key limitations for true off-road thrashing. It offers a number of features and shared aesthetics of groupsets above it. Alivio: Alivio is top of Shimano’s ‘recreational’ mountain bike groupsets. More aluminium is starting to be seen at this price, with greater rust resistance compared to models below. Acera: Acera appears on many entry-level bikes and offers either 8 or 9-speed gears at back, and three at the front. Shimano RapidFire trigger shifters are found here, and a 3x7 or 3x8 gear setup is typical. Again, it’s not designed for mountain biking, but light off-road use is applicable. Altus: Altus is Shimano’s entry-level groupset and is occasionally seen on budget mountain bikes. Expect a plastic grip shifter and 3x7 gears at this level. With basic stamped steel and plastic components, it’s not designed for the rigors of off-road riding. Tourney: Shimano's most budget groupset, often seen on basic recreational and even kids bikes. Below is a brief breakdown of Shimano's mountain bike groupsets.
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