Every manufacturer is going to tell you theirs is the best. Every end user is going to have a different opinion as well as their applications and working environment's are different so their experience's will be different even if they use the same product.
For starters what are you looking for (fluid type, ie... gear oil), operating conditions (cold, hot), are you looking to reduce the number of lubricants you use by using multi purpose products. No one product fits all applications. Fill in some of the blanks as to what you are looking for and what you want it to do and we can probably steer you in the right direction.