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I assume I would use the same password to access those clients?

Yes, your credentials are the same on all clients as they are stored in the blockchain.

Are there any comparisons (preferably a chart) between the different UIs?

Not to my knowledge. Might be a good idea for a post 😉
I personally enjoy using https://steempeak.com which has become my favorite client.

BTW, feel free to vote for me as a witness if you like my work to help the community.

I'm afraid that the scope of reviewing the various clients (I don't even know all of them) is rather large and, seeing as I'm unemployed and Steemit is not proving viable for earning money unless I can find a reputable voting bloc, I really can't afford to spend time - although it would be a good project.

In addition, I'm seriously considering abandoning this platform since it has proven almost impossible to earn money as an author, and there are too many abuses (such as voting blocs that vote crap content, curators who take most of the reward for themselves and don't care about quality, etc.).

Indeed, I appreciate your assistance.

Voted: c81cd6967d6d8e39d0f9add4c0f524327d474cdc

Being successful on the Steem blockchain is a long run. Commitment and networking are the keys.

Thank you for your support and witness vote @reveurgam, really appreciated!

Here's a tech question for you. If you can, I want to know how one of my articles has been "walled off". When I try to access it, I get 403 Forbidden.
https://steemit.com/review/@reveurgam/beware-ists-parcerly-com-package-job-scam-in-murrieta-california

To be honest, I have no idea. Maybe because the content infringe steemit.com TOS.

Your post is available on [SteemPeak)(https://steempeak.com/review/@reveurgam/beware-ists-parcerly-com-package-job-scam-in-murrieta-california)
That's the beauty of the blockchain: even if "censored" on one front-end, it's always available and often visible on others clients that do not apply filters.

I have no idea. I've got a few other expose's on my account and none of them have this problem. Oh well, I hope it'll stop soon.