Best Base for the LS+

What are the advantages of using the T3 instead of the T1-M as the base for the LS+? The bundle on the website has the T1-M but I saw a post on here saying the LS+ couldn't be used to its fullest potential without the T3.

The T3 is able to track a few more signals that the T1-M.

Also the T3 can use GSM or CDMA internal modem and can use an external UHF antenna. The 1M can only use GSM internal modem and has a standard permanent uhf antenna (green stick).