The burrs are the part of the grinder that crushes the coffee beans into a uniform size This is an essential step for creating an excellent cup espresso/coffee. They are bigger and heavier than blade grinders and consume more energy. Ceramic burr grinders usually cost more but can offer the level of fineness required for espresso. Burr Grinders are durable and last long. 

The Blade grinders are sturdy appliances and come with a slip-resistant bottom. They are compact and can be placed on the countertop.  The key downside of a blade grinder is its grind consistency, which can vary a lot from fine powder to small chunks. Also if charged with a static charge the ground beans are often turn up sticky and messy.

Both are known for quality and flexibility; the only primary difference is the shape of their rings. In flat burr, the rings are placed horizontally in the machine. Coffee beans grounds through the burrs that cut the beans even further, to achieve a high level of fineness and consistency. However, they cost more as compared to conical grinders.

In Conical burr, cone-shaped rings are placed in such a way that they sit inside the other. The cones act as a funnel and direct the beans down into the burr. They make less noise as compared to flat burr grinders. 

Particle Size and Consistency  

Achieving fineness is vital for espresso lovers. Make sure to look for a coffee grinder that comes with easy controls and produce consistent coffee grounds. 

Durability  

Go for a coffee grinder that is made of quality material like Stainless steel or metal as they are durable and last long. 

Ease of Use and Cleaning

A good grinder should justify the price, and offer convenient operation and comfortable cleaning.  Some of the latest ones have a digital timer that makes it easy to grind the exact same amount of coffee each time you brew.

Price 

There are a variety of styles available in the market and the price often varies according to the features offered. Therefore, before investing in a grinder, keeping your budget and your requirements in mind is important. 

Size and Capacity 

If you are counting on your coffee grinder each day for that morning jolt, you want a model that fits conveniently on the counter or in a cabinet. Be sure to consider your coffee brewing choice to decide on that suitable coffee maker. It is also essential to assess how much coffee you want to grind at once as there are single-serve coffee makers and multi-serve coffee makers to choose from.