If at all possible you should travel to a shop that stocks a range of brushes. Handling them will help to a certain degree. Failing that, most online places will refund fully on any unused brushes.

Not many find that one brush will cover all options. The shorter loft brushes are very popular at the moment, for good reason. However, you may find that a longer loft brush floats your boat. One mans meat is another mans poison.

Sorry for adding confusion to your dilemma.

Good luck and enjoy!