The injection is relatively easy/straightforward, it’s simply a jab. 

Creams and gels need to be applied properly, for example the rubbing in some (but not all) of the gels breaks down the testosterone and renders it as ineffective. 

Patients have to remember to apply the gel daily and rarely people get a skin reaction. 

With the gel or cream there is a risk of cross contamination, there is a genuine risk of another individual taking on Testosterone by accident which could have implications. 

In my observations of others many people do not apply gels in the correct place and do not follow the instructions that are provided in the packaging/as recommended by their healthcare professional.

Implants are not available in all countries. 

Usually in the UK (I live in England) a patient would start out on the gel. Once they have had a chance to experience testosterone and fine tune the dose if necessary they might then move onto the jab. They might stay on the gel. 

Once the jab is in the body it stays in there until the next dosage is given, it can’t be removed! 

Gel can be stopped and/or the dose reduced, there is more chance the prescriber being able to control the patients early experience of using T. 

The jab doesn’t suit everyone and it is absolutely crucial that it is administered correctly. 

Here in the UK the jab is typically every 12 weeks or so and is administered by a trained nurse which is free at point of sale, funded through taxation and the NHS. This is of course different to the USA and other countries. 

The gel is applied typically daily which means that the dosage remains fairly constant if it is absorbed properly whereas the jab loses its effectiveness as time passes by before the next jab. 

I have been on both the jab and the gel. I’m currently on the gel and I get on fine with it. I actually prefer it to the injection because the dose is more consistent.