Glock Vs. SIG

Need your input. Been putting it off because im a fan of all metal guns such as my 1911 and S&W 3919 and colt python. however its come time that I expand my collection to the plastic category. This is mostly due to the weight factor when it comes to CCW. Ive got my choices down to Glock and Sig Sauer. Looking for pros and cons to both.