I own both. The Ella is made of solid pure silicone, so it has some give to it, although it's not a particularly plush silicone, and both ends are insertable. The Gigi is pure silicone over hard plastic, so it has no give to it, and only one end is insertable. They're pretty close in size and the g-spot ends feel very similar in use.
The Gigi can also double as a clit vibe.