Hey i have the DOPPLEGANGDOPPLEGANGER700c and i need help. I want to change

Shift method Exterior 7 steps Wheel diameter 700 × 28C Other ● Total length: 1700mm ● Weight: 12.8kg ● Saddle height: 860-980mm ● Handle height: 860mm ● Handle width: 560mm ● Tire size: 700 × 28inch ● Frame color : 420-BK: Black × Orange 420-WH: Black & White 420-RD: Red × Black 420-BL: Metallic Blue 420-BD: Marine Border ● Frame Material: Steel ● Front Fork Material: Steel ● Transmission: Shimano 7-speed Speed ● Pedal: Fixed Pedal VP-992S ● Shift Lever : Shimano Samushifter right: 7 steps - Free wheel: MIN: 14 T × MAX: 28 T - Chain wheel: 46 T - Brake: Front and rear: Caliper brake

Heres the specification. Im choosing between wtb crossboss or wtb resolute