Ideogram solved the problem every other generator struggled with: text. If you need an image with words in it, a logo, a poster, a social graphic, Ideogram renders legible, correctly-spelled type far more reliably than Midjourney or DALL-E, which famously garble text.
That focus is its niche. For general photorealism it trails the leaders, and its style ecosystem is smaller. But for the specific and common job of "image with readable text," it is the first tool to reach for, and the free tier plus low entry price make it easy to test.