It depends on what you want. Both can have there ups and downs.
Professionals are normally very experienced and either tend to work at dungeons where they will have a ton of equipment/toys at their disposal or they work at home or a place they rented, but even then they will still probably have a lot more equipment/toys then most people off of fetish sites. You can have a connection with a professional(Some even will let you be their subs/slaves), but it takes a lot of sessions/money to get to that point. Some people don't want to bother with relationships due to various reasons. They just want to get their fix and go on about there day. This is when a professional really comes in handy. Then you have what I like to call the vanilla issue, which is a client that is either dating or married to a vanilla who won't put out for them kink wise, so then they go to pros to get there itch scratched.
Partners are great if you want something more intimate because most pros don't allow sex. It is also easier to try to have a personal connection/bond with a partner. You can usually hang out with them more and the main awesome thing is you don't have to pay for play. The only issue is they may not be as experienced or have as many toys/equipment as a pro(Heck they might not have anything at all). Also wanted to say using people to full-fill your kinky sexual desires not cool and this is especially so if you lead them on into thinking you two will have some sort of a future together.
