Transdermal creams really aren't great. They are a pain in the butt to apply every day and they easily rub off.
You won't get much in the way of strength gains or muscle size from it. Topical testosterone creams are only really beneficial for testosterone replacement therapy.
The problem with topical testosterone creams is that they aromatize into estrogen at a much higher rate then testosterone injections. If you want to use a transdermal instead of injectable testosterone, make sure to use an AI like liquidex AI from n2bm.com with it to keep estrogen in the low-normal range. This will prevent estrogen related side effects like water retention and gyno.
Personally, I would just use injectable testosterone. Easier, cheaper and much more effective.