If the evaluation is at a value that is easily typed into a dialog box, the Context Panel options are convenient. However, if the value is more cumbersome, then the evaluation template can be the more convenient tool.

The older subs command, which makes a literal replacement, is not equivalent to the eval command because it does not evaluate after making the replacement. For example, using subs to set $x\=0$ in $x\/\sin \left(x\right)$ returns 0 because Maple sees $0\/\sin \left(0\right)$ and does not evaluate the denominator to zero. The eval command evaluates the denominator to zero, and Maple issues a division-by-zero error, as it should. In general, the eval command should be used for making "substitutions" into expressions; subs is used for strictly literal replacements.