It depends on what features you are looking for. Some people like distortion on Pod XTL but some prefer BOSS or Digitech. So for sound wise, drive and decide yourself. Of course you can find out detail specifications from their website. Following are my findings.
Pod XT Live – multi effects, lots of amp models, USB interface that is very cool feature as you can store all your patches in the computer and you have software to edit every parameter of your effects and amp settings.
Recording is also possible via USB, so you don’t need additional hardware like midi for PC recording. But there is no recording software included, so you need to prepare to pay for recording software. Line6 riff tracker software for Pod XTL owner is about 99 USD. No built in drum machine by the way.
Price: 670 S$
Digitech GNX4 – Digitech’s top of the line guitar workstation, it has almost everything you need. Built in programmable drum machine. USB interface for recording and patching and software is also included. Many amps models and effects of course. Price is not cheap in Singapore. It also supports CF memory card, so you don’t need PC all the time for recording or playback backing tracks.
Price: 1300-1500 S$
By the way, Digitech GNX2000 will launch in end of this month, all features of GNX4 but less 200 USD. There is no on board recorder but you can have two-way USB connection and recording software. 100 over drum patterns but not programmable.
GT6 – Some people love it, some people hate it. Anyway why do you want GT6 when GT8 is in same price?
BOSS GT8 – It has awesome unlimited sounds with dual COSM engine. You can switch amp channels or switch between two amps from your GT 8 or layer the effects. Tested and love it but no GT software included like GT PRO or GS 10. No USB interface, you can have S/DIF digital output or midi for recording. Some people use normal 1/8 cable directly from GT8 to your sound card for recording. You need a recording software and good sound card.
Price: 700 S$