In general most harnesses are going to be pretty similar. The main differences are going to be weight, comfort, durability/longevity. For climbing outdoors you'll want to find a harness with stiffer gear loops, as fumbling with them sucks when your pumped. You may also want adjustable leg loops as it is easier to put on over shoes, but this adds some weight and likely cost. In general though,. It really doesn't matter, find something comfortable.
Without knowing more details talking to a sales rep is your best choice
Best to get the advice in person. Drop in at your convenience
IME can help you with any sort of harness you need, or anything else climbing or mountaineering related. I only buy mine at IME because they will take the time to help you find one that really fits. Last month I went in to buy a new harness to replace my beloved but worn Black Diamond. I tried on probably 6 different brands in multiple sizes until I found the best fit. The owner helped me the entire time and I am super happy with my new one.
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