Cannondale Synapse 3 vs Trek Domane SL 5

“Get the Caledonia if you want a more sporty snappy handling endurance bike with a max tire clearance of about 34mm. It'll feel very slightly more aggressive than your domane and the SL5, but it's still an endurance geometry. Get the Domane if you want a more relaxed geometry, and a bike that can do some off-road riding. it's less sporty than the caledonia. Max tire clearance of 40mm so you can take it on some light gravel trails with wider tires. Might even say it's more comfortable both in terms of frame design and geometry. The frame has an isospeed seat tube that allows some more flex in the rear. Geometry wise, it's also more upright and slightly more relaxed. It's basically an all-out endurance bike, meant for long days in the saddle.”

“With a $2k budget you can get very nice new bikes. For example the synapse in aluminum with 105 and you will get disc brakes https://www.cannondale.com/en-us/bikes/road/endurance/synapse/synapse-105”