Presuming we are talking about UPS STANDARD (surface).
If the value of the package is under US$200 there is NO brokerage charge.
For clothing I would contact UPS brokerage services and ask about any special conditions. Clothing/textiles are subject to quotas and other conditions beyond the basics.
It's likely that single shipments to end user consumers are exempt but I don't know (but they would).
At the same time, is there anything else you can point out on how UPS might differ from Canada Post in a negative way?
YES YES YES, their billing system is crap, their billing department are DUMB, I've been using them for 2 years (plus many more in a previous business life) currently my shipping software is in Kilo's but my billing account is in Pounds no matter how I try they can't seem to change it. This means all my shipments are reported as being overweight, billing are revised and then someone manually Makes a correction AND SENDS ME A PAPER CHEQUE TO COVER THE OVER BILLING. So far the best I've been able to do is change my billing period to monthly (direct bank debit) so I only get 12 cheques a year instead of 52.
Service has been ok, nothing lost or damaged but slightly delayed delivery (1 or 2 days) is not uncommon.

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.