Check the seller for warranty details, yes.
SIMBA repairs phones?
What do you have in mind here? Obviously lots of phones work fine on SIMBA's network. The vast majority of SIMBA customers haven't purchased their phones from SIMBA.
But since you mention compatibility, let's talk about frequency band support. It looks like the Motorola Moto G35 supports the following 5G bands that the Sharp AQUOS wish4 doesn't support: n20, n26, n77. For 4G LTE it looks like these bands are on the Moto G35 but not on the wish4: 2, 20, 26, 32, and 42. I can't be 100% sure of that since these phones could vary a bit depending on region, but that's what it looks like. A lot of SIMBA customers roam internationally, and the support for more 4G LTE and 5G bands is helpful in that respect.