oooough that's a tough question! Picking An Favorite is hard, so just gonna give like, a rough top list:
- Proton first stage: 10/10 shape, great Horse's Ass story behind it, all around pretty neat
- DCSS: great shape, lovely greebles, reliable workhorse
- Titan IIIC boosters: comedically oversized, wild fluid-injection TVC, hilarious
- Transtage: funky asymmetrical design, has "trans" in the name, how could I not
- Soyuz core + booster combination: absolute classic, beautiful separation, iconic shape