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These are good questions!
I don't personally have any experience with these specific online training centers, so I only have my opinion and experience. I would think that with your background, you could pick up Tableau very well on your own. Spend some time with the online training videos provided free by Tableau, find a data set and build a dashboard, deconstruct some Tableau Public vizzes to see how they were created and work through the analysis others have done (and possibly find flaws in their approaches).
It would be interesting to understand a little more about these online training centers to see how they help with job placement. It's possible they might be providing a useful service. But it may also be simply a reference and a line to put on your resume, which might not be that helpful. In my experience, many employers would be more impressed with a good portfolio of Tableau dashboards that demonstrate your ability over a course where you may or may not have learned something. I'd definitely get some details.
Pursuing the official certifications is very commendable. Whether they would help secure employment would depend on the employer, but they would demonstrate a level of competence that might set you apart.
That's my perspective. Maybe others will have different views to share.
I really appreciate the advice thank you. Do you know of any particular large or useful online data sets that I can gain access to in order to start playing around with the dashboards? Given your feedback I'm certainly leaning towards the self taught option at this point.
Kaggle is a great place for that, sorry for the super late reply!