Suguru Issue 2 is the sequel to Issue 1, which has 36 more satisfying Suguru puzzles to solve. Whereas Issue 1 has tips, Issue 2 has more puzzles and is therefore considered the better of the two. That said, I would recommend you get Issue 1 if you haven't yet done so!
Issue 2 has guest puzzle Futoshiki, and reveals that Issue 3 will have Stars as its guest puzzle.
To plan for Issue 3, here is a Stars puzzle I made!