as now a days the main focus of software developers is to deliver the functionality upto the satisfaction of the customer in very much short time that requires a short but hybrid team well communication between them and also parallel working on different phases of development.,
after focusing all of this is Agile the best practice or any other can be more effective???
I don't know about you, but I wouldn't be terribly keen on the idea of fly-by-wire systems for aircraft and other safety critical things being developed using agile methodologies.
Balancing Agility and Discipline: A Guide for the Perplexed is a good reference for a broader discussion on the subject.
There's almost never a single best answer. Each solution has its strengths and weaknesses. You just have to choose the right tool for the job.
The best practice is the right balance giving you full confidence and control of what is going on and is being delivered as the result of the team's work. The strong bias towards any pole is a sign of management unprofessionalism.
Addition (all IMHO, subjective): The interesting phenomenon is Scrum (similar practices were successfully employed in engineering companies in Soviet Union), a "pseudo-agile" approach, where the work is partitioned into a small "micro-agile" blocks but the sizes of blocks are so small and the progress is monitored so strictly that the resulting quality can be quite close to the one when the strict approach is used. In fact, with properly tuned "micro-agile" granularity individual contributors get the full illusion of the freedom (well, freedom indeed) in decision making while the team performance and stays under full control and is well manageble.
Short answer: no. I find that a lot of Agile trainers have never actually coded themselves!