About security.....

dyn!o
Asprotect is no more secure (after release of stripper 2.07). Version 1.3 too (because of stripper 2.11 ). Maybe AcProtect is more secure, because it is not so popular. But it is low security now too.

SVKP is good, but I found only one serious program protected with it - TweakXP 3.

Xtremeprotector is very strong but it has a big minuses - 1) heavy code 2) rebooting if some debugger/decompiler dectected.

Other packers/cryptors are less secure.