We took Air Arabia as they offered a superb deal on flight + hotel, so we had to travel from Dubai to Sharjah. Travel time is not bad at all, except that the cost is a bit more steep as there’s a surcharge into Sharjah. I had very little or low expectations of Sharjah Airport as my officemate said it was not great, but I actually liked it! It’s one of those old airports that due to the size and age, it’s a breeze to get in and out. No frills - just how I like it.
They even have a playground which was clean and had a lot of options for kids. For a parent, that was a super plus point.