They would definitely have different geometries, both bikes. The Crosstrail will likely have a taller frame at the front (to allow room for the suspension fork) with a more sloping top tube.

Sirrus' head tube angles are between 70.5* for the smallest frame to 72* for the largest frame, with 73* or 73.5* seat tube angles for all sizes. Chain stay length is 445mm on all frames and wheelbase spans from 1056mm to 1103mm. Trail is between 60 and 70mm depending on frame.

Crosstrail's head tube angles are between 70* and 70.5*, depending on frame sizes, with a 73* seat tube angle on all sizes. Chain stay length is the same 445mm as the Sirrus and wheelbases run from 1067mm to 1117mm. Trail is 84-87mm depending on frame.

The Crosstrail will VERY likely feel like the more comfortable bike to you. It has slacker head tube angles and more trail, which contribute to a stable steering feel, with a greater tendency to want to track straight. The steeper head tube angles and reduced trail on the Sirrus will make it quicker to react, but will also have it to feel less stable. The longer wheelbase of the Crosstrail will also increase its stable feel and reduce its maneuverability.

It's one of those things where you have to strike a balance between something like a pure race bike at one extreme and a laid back beach cruiser at the other extreme. Somewhere in the middle is the right balance for you. Both the Sirrus and Crosstrail have designed-in compromises for both comfort and maneuverability. The Sirrus draws that line closer to road/race and the Crosstrail draws that line closer to mountain/cruiser.

There's nothing wrong with that. My 2015 Trek is a Verve 3, which is similar to what the Specialized Crossroads used to be: a comfort hybrid with a suspension fork. It's large, it's heavy, it's incredibly comfortable, and sometimes that's exactly what I want to ride.

Two other ideas in the Specialized lineup include the Crossroads and the Roll.

The Crossroads is a comfort hybrid with large volume tires and a rigid fork. You might consider this if you don't like the suspension, but still want a more relaxed geometry. The Roll is even more in that direction -- it has a rigid frame and fork, but uses smaller wheels with even larger volume tires (650b size) so that the rolling diameter is about the same as a traditional hybrid, but it's got even more air volume for comfort. The Roll has very relaxed geometry and is a pretty interesting bike in my opinion. They sell it in both step-thru and traditional top tube versions.