Some companies support is worse than no support. Ask the company for names and phone numbers of people who use their program if support is very important to you. If at all possible try the program before you buy it. You will be using the program for a long time. You need to be sure that it is indeed what you want.
Some companies have a working demo version that they sell or give away.
Other companies have a money back trial period. Higher price also does not mean it is better. Buy what you need. If you do not need the features of a more comprehensive, expensive program, then do not buy it. If you like it you will forget what it costs.