We all remember from English class the rule of Subject -- Verb Agreement, which means you wouldn't say "That book are great?" but rather "That book is great." The same rule can be applied to photography, if we look at how the subject of the photo relates to the framing of the picture, what I call Subject -- Frame Agreement. The most common incident where we find this error is in distance. Being too far away from the subject ...
When trying to choose one piece of gear over the other get your hands on your choices and see how it feels and performs to you. Then do your research on reviews. Ultimately this piece of equipment will be with you for a several years so you have to be comfortable and happy with it.
