What is the major difference betweet 3 differnt ways of creating a DCFIFO?

[Altera_Forum]

What is the major difference betweet 3 different ways of creating a DCFIFO? 

1). by MegaWizard plug-in manager 2). by a Symbol in BDF editor 3). by a Qsys In which case which one should be used? Which one is less buggy?

[Altera_Forum]

They all create a DC fifo that work identically (its the same code underneath). But you cannot simulate 2). Avoid BDF editor like the plague.

[Altera_Forum]

Here's what I found to answer my question: 

http://www.altera.com/support/kdb/solutions/rd08152003_8247.html?gsa_pos=19&wt.oss_r=1&wt.oss=dcfifo

[Altera_Forum]

1) Generates a DCFIFO component with a "basic" interface, to be used directly in VHDL/HDL code. 

2) Does the the same as 1 and generates a component to be used in BDF.  3) Generated a DCFIFO component with an Avalon-ST interface, to be used as part of a Qsys system.  So, you use 3) when you need a DCFIFO in a Qsys system 2) when you need a DCFIFO for a piece of logic you're creating using BDF. And you should avoid BDF at all if possible. 1) when you need a DCFIFO for a piece of logic you're creating using VHDL/Verilog.