Both are your basic mode based games of course, get the modes and do the wizard, so depth/strategy are something that I personally couldn't find in either... reading some of the above posts though, maybe I was missing something in the months I had each game set up?? Both have uniquely interactive mini-playfields, both widebodies... I'd say it all depends on how much the theme, artwork and music grabs you! Personally both are boarderline keepers for me, but both end up being on the non-keeper side of the line simply because of the lack of depth/strategy (at least that I could tell!)... I also find the sounds eventually tiresome and the tunes end up driving me insane as I try to sleep at night
Maybe I need to keep my next TZ and give the game another shot... I remember several modes can be started at once on that one (whereas IJ you can only start one at a time), so I guess there must me some strategy in TZ regarding what modes to run simultaneously so that the shots count double...?? Is that the depth people mean?