I am considering to buy the Axel or Emerald boots..
What are the big difference between them?
What should I consider to decide my new boots?
I am going to match my boots with the Feelgood v rocker board and lexa est binding.
Thank you!

First of all, boots are the most important part of snowboarding. If you feet are comfortable then you will be able to ride and long as you want to. If depends on if you want to focus on park or all mountain. The Emerald is an all around boot, and the Axel is a park boot with materials made for park riding. Flexable liner and sole give the rider great board feel. Both are excellent boots, so you decide park or all mountain.

The largest difference comes in the liner... The axel is slightly higher end and comes with more supportive poly urethane support panels. Will you notice a tremendously large difference? -- probably not. It will take a lil' longer to breakdown over time. One other difference is the articulated cuff on the axel... it just gives a lil' less binding in the shell when flexing forward. Flex wise both boots are very similar. The last difference comes in the outsole. The axel's is EST optimized while the Emerald has a traditional outsole. EST optimized mean your heel sits much flatter and is not ramped like almost all other boots (think about a running show compared to a vulcanized - vans style - shoe) you have much less sloping downward to the toes. This gives you a greater board feel underfoot as material is removed. Goes great with Burton's EST bindings and a channel board... you feel so much more and get a greater flex! Both boots are awesome and I'm sure you'd be stoked on either pair!!!