I'm not familiar with Inked Voices but I know many, many people who love 12x12. I was a member several years ago and loved the motivation to complete a draft every month and loved the FB group. For a few years I paid the Gold Status to have the opportunity to sub to the agents, but once I found an agent I felt like I was paying to be part of a FB group and decided to spend my $ elsewhere.
If you are new to PB writing, I do think the community and accountability of 12x12 might be worth it. If I remember correctly, when you are new member, you cannot pay to the higher amount to sub to agents, so just be aware of what the various levels will give you as you weigh your options. Even though I decided to quit after a few years, I still have many friends who still are a part of it, both agented and unagented. I think there are many webinars and such included with the price you pay, so that is where a lot of writers are finding their value even if they can't sub to the agents through 12x12 that are featured each month.
I hope this helps.