Treadmill vs. Elliptical?

Recently found diabetes runs in family, father diagnosed 1yr ago. Past 4yrs I’ve gained 30lbs & now made up mind to lose it. Past 1yr I’ve drastically changed my diet. I buy local & organic produce as much as possible. Don’t fry foods, eat plenty fruits, vegetables, whole grains (flax, steel oats, quinoa, etc). Haven’t omitted but do limit bread, dessert, rice, sugar intake. Eat mostly seafood, poultry, 2 /3 times/month red meat. Drink water & green/coca tea (plain). Don’t drink soda, rarely juice. 2wks ago started walking home from work (3miles,1hr30m) Was going to gym but really dislike classes & tired of waiting 4 machines 2 become available. I enjoy treadmill & elliptical machine but not sure what’s good 4 my body type. I’m latina & have larger lower body & smaller upper body-pear shape. Considering equipment to buy @ home (small NYC apartment). Elliptical or folding treadmill? I want to lose weight but Lord knows that I DONT want to make my lower body larger (muscle wise). Help?!
I’ve joined Sparkpeople.com which as helped me monitor eating habits (great advice from fellow yahoo member). Having hard time losing weight though. Summary of eating habits-Everyday breakfast:1/4 cup oatmeal, 1/2 cup 2% organic milk, 1 tsp cinnamon, 2 tbs organic whole ground flax, 1 banana, cup green tea. Typical snack: 1 apple, 1 mango, 1 plum, sliced melon or luna bar. Typical lunch: 1 cup noncream based soup w/small whole grain roll or side of broccoli,spinach, or salad. Typical dinner: baked,steamed, grilled, stewed, or seared chicken/seafood w/1 large cooking spoon rice/beans or 2 tortillas & side of salad/veggies mixed w/herbs. Going 2 make appointment 4 physical w/doctor wondering if something’s going on inside.