Greetings.
Obviously, I have not checked every math book in existence. Disclaimer aside, I believe that Stroud's "Engineering Mathematics" (which I own) is the best text book of its kind, and I have high hopes for "Advanced Engineering Mathematics" (which I intend to buy).
If you're having trouble with Mr. Stroud's gentle, thorough tutelage, then you have trouble indeed!
The trick is finding a math course that actually uses either book. Being an American, that was difficult (Stroud was from the UK), but it's a problem I've managed to overcome for the moment.
While not an engineering book, no discussion of math books can be complete without mentioning Silvanus P. Thompson's "Calculus made easy". If for no other reason, it's worth having for its inscription: "What one fool can do, another can."
Cordially, Richard Kanarek