In reply to jcooper1459:
Have you done anything like these before?
The conditions on Kili and Aconcagua are massively different, both are great experiences in their own right. I did Kili just over 2 years ago, perfect weather but a bit chilly on summit night with -10 windchill, completely worth it to be up top as the sun rose and an hour or so later we descended in just base layers. Did it over a week and fairly cruised up it, the porters carry everything apart from your day pack and make it really quite simple by comparison to other peaks.
Went to Aconcagua this January, got to base camp in blistering heat, weather started to turn a bit the day we did a gear stash and just got worse from then on. Our highest camp was only Camp Canada because we got turned around the next day by really grim conditions but night temperature was around -15. The gear carries are heavy, the weather can change from 10 to minus 10 in minutes and it can go from blue sky to complete whiteout in the blink of an eye.
Aconcagua feels much wilder and grander, sure there's a whopping great base camp but it's in a truly beautiful spot. Kili is magnificent for its solitude.
Enjoy them both and good luck with the summits!