Asking your questions here is just fine, it gives others an opportunity to chime in, and to learn as well. There are many finer details to running a cycle, my friend. Yes, you can literally add Rad to a cycle, if you are asking that you may not have a good grasp on what it is or what SARMs are. Adding a SARM to a PH/DS cycle is relatively risk-free, in comparison to what it means to run a PH/DS in the first place. You seem to think they stand on equal footing, and that is not the case. A SARM is less side-effect prone than a PH/DS. And also more mild in it's results, typically. Though not always.
All the questions are fine, no problem! Halo is definitely the better option IF you are comparing it to Rad as far as ability to gain strength, gain lean muscle mass, burn fat. That being said, it requires liver support, and is more suppressive than Rad. Everything has it's trade-offs. Perhaps you want to think this over more before jumping into it, it's highly recommended to research each compound you are going to use in a cycle before you use it. We can answer questions, but there is a lot that needs to be understood to use these compounds safely and responsibly. Each compound has its own set of risks. And then there is on cycle support, post cycle therapy, time off after post cycle therapy before running another cycle. That entails liver support, lipid support, prostate support, blood pressure support, risk of hair loss, risk of body hair growth, low libido, lethargy, suppression/shutdown of the HPTA (endogenous testosterone production)... The list goes on.