These units can all be used hand-held to detect and record bats.
The Anabat Walkabout, Batbox XD, Pettersson M500 & M500-384 and Wildlife Acoustics EM Touch all have real-time sonogram display (Batbox XD, Pettersson M500/M500-384 & Wildlife Acoustics EM Touch when connected to suitable device) and the Batbox Griffin, Elekon Batlogger M and Pettersson D1000X do not.
The EM Touch connects to compatible Apple iOS devices (don't let that put you off, it is very good).
If the real-time sonogram display is important to you, I recommend either the Anabat Walkabout or the Wildlife Acoustics EM Touch. If you don't want the display it would be the Batbox Griffin or Elekon Batlogger M (both of which can be used passively as well).
Choose whichever one has the features that suit you best and if you need help choosing, give me a call on 0333 9000 927 (+44 333 9000 927 from outside the UK) or email me.
You'll get a free bat calls book worth £30: either British Bat Calls by Jon Russ or Social Calls of the Bats of Britain and Ireland by Neil Middleton et al; with the Walkabout, Griffin, Batloggers and D1000X.