I had a lot of fun playing with the Keezy classic recorder+looper and the Sampulator keyboard sampler. I like the Sampulator interface in the way that it looks very neat and straightforward as it visually maps all the samples to each key on the keyboard, with first percussion samples on first two rows and melody on the third row and human voice samples on the last row. There is a lot of possibilities to the sound that users can create and it can sound very rich because there're so many keys to play with. It also comes with a metronome/time signature and a recorder.
Similar to Sampulator, the Keezy classic operates on smart phones, instead of pressing the keyboard to trigger sound samples, Keezy divides phone screens into 8 grids and tapping each grid triggers a sample. Sample size wise, there are a variety of sample packs but each one can only play 8 samples at a time, as opposed to the greater possibility of sounds generated from a full keyboard. However, an advantage of this is that users can easily locate which grid triggers which sample, and trigger samples they want with higher accuracy. Keezy also allows users to record their own samples and map them onto the grids so that they can create their own simplified MIDI controller to trigger 8 samples of their own, as well as make as many sample packs as they want, which is a cool feature that Sampulator doesn't have.