It can be hard work deciding which is the best horse to pick when you are placing a bet. If you following horse racing a lot then you will have a much better idea of what horses tend to win and under what conditions but even with some knowledge it can still be difficult.
It is really a decision you have to make as to whether you are going to do lots of research in order to determine which horse you want to win or trust the bookmakers odds or just choose a horse you like the sound of.
It can take a long time looking at the course conditions, the horses and what they like and their past race history. You will also need to study the jockeys and research the same sorts of things. This can be fun if you are a big fan and have lots of times but if you spend a lot of time doing the research and your horse doesnot win then it could be really frustrating.
Trusting the bookmakers puts the choice out of your hands. They will have a favourite horse and if you choose that one then odds are that it will win. This can take some of the fun out of things and also their favourite for the race will win you you the least amount of money. You may decide to choose one with longer odds that may have a lower chance of winning but will get you more money if it does.
Lastly you may just like to choose the name of the horse you like the sound of. Some people choose one which has some significance to them, maybe part of the name is the name of someone they know or something like that. This can be a really fun way of choosing and it does not take up much time.