The best book is the one which you understand and can really get to grips with. A lot of this hinges on your maths background. Those with a strong engineering maths and physics training can do well with Electrochemical Systems by John Newman but it is beyond the wit of most chemistry (and almost all life sciences) graduates. It is rare for any one book to meet all your needs. I use a combination of the Southampton book (Instrumental methods in electrochemistry), Bard & Faulkner (inevitably), Compton's Voltammetry book, Bond, Oldham, Myland "Electrochemical Technology" and Kissinger and Heineman's "aboratory Techniques in Electroanalytical Chemistry". Some rather old books are still worth reading, as well as Newman: Delahay "electrochemistry at solid electrodes" and Ives and Janz "Reference Electrodes" come to mind. If you're doing electrochemistry without a chemistry first degree-a more common situation these days as activity in biosensors and diagnostics- then the Oxford Chemistry Primers are well worth investing in, to make sure that you're properly appreciating the theoretical basis of the physical chemistry.
Apart from Bard & Faulkner and Bockris & Reddy which are of course always highly recommended, The Principles of Electrochemistry by Duncan MacInnes (Dover, books) is a book which I find myself reading in quite often. It is a rather old text first published in 1939, so more modern techniques are not dealt with. But for principles it is very comprehensive.
Yuliy D. Gamburg, Giovanni Zangari. Theory and Practice of Metal Electrodeposition. New York Dordrecht Heidelberg London.- 2011, 378, ISBN 978-1-4419-9668-8 e-ISBN 978-1-4419-9669-5 DOI 10.1007/978-1-4419-9669-5
I studied using the book "Electrochemistry" from Carl H. Hamann and Wolf Vielstich. I found it very helpful and easy to understand (for a total beginner). Better than Bard&Faulkner or Bockris&Reddy in my completely subjective and personal opinion. Although the latter two are excellent books, too!
I agree with Danny. From personal experience, if you are a beginner, you may start with ''A First Course in Electrode Processes (Derek Pletcher )'' and some small-sized oxford primer books such as Electroanalysis (Brett & Brett) and Electrode dynamics (Adrian Fischer). Another book entitled 'Electrochemical Science and Technology: Fundamentals and Applications' by Prof Bond and colleagues are available online for free. For a beginner, this book is really easy to understand compared to other classic textbooks including those from Bard and Faulkner. Although you are looking for book recommendations you may find a series of electroanalytical lectures in youtube by Prof David O Wipf of Mississippi State University useful ( https://www.youtube.com/watch?v=bMNyt0rE5FE&list=PLrClziktuKeOkae-F-jJN6R3zUFaYh1Kk )!