Individuals vary widely in how successfully they learn a new language after acquiring their first. So some English learners of French may find it helpful that many French words are already familiar from English, while English learners of Norwegian may be helped by grammatical similarities between the two languages. Once this barrier has been overcome, the new language should be no harder to learn than any other. One group of languages, pidgins, are always easy for the learner. This is because they develop in situations where no common language is available and speakers have to learn a language quickly in order to bridge the communication gap.
Pidgins characteristically have small vocabularies, short words and simple, regular grammars.
Languages which are not pidgins sometimes have one or two of these characteristics but very rarely have all of them. This question is as much a political as a linguistic one. What this means is that there is no systematic linguistic difference between a language and a dialect. Both are linguistic systems with grammar and vocabulary and are or can be learnt natively by their speakers. There is nothing inherently better, more systematic or more logical in a language than in a dialect , or vice versa.