Inland Taipan snake and Belcher sea snake are more toxic.

Inland Taipan snake: It is the most poisonous land snake species in the world. It can kill 200,000 mice with a venom. Its size is smaller than ordinary Taipan snake, and the adult snake is only about 2 meters. It is distributed in and around Victoria Desert in central Australia. There is a kind of protein called urinary sodium excretion peptide in the venom of inland Taipan snake, which mainly acts on heart cells and relaxes myocardium. Its neurotoxin mainly inhibits and paralyzes nerve endings and blocks the connection between muscles and nerves.

Belcher Sea Snake: Its venom is similar to land snake venom, and it is also a mixture of various protein, mainly containing neurotoxins, muscle toxins and various enzymes. Its toxicity is relatively stable, and it is also stable in acid and alkali environment. The venom of Belcher sea snake is similar to anesthetic, which makes the brain relax its control over various organs of the body and leads to muscle relaxation. Generally, the whole body feels light, and then the hands swell and suffocate, or the whole body is paralyzed. For various reasons, it is not considered as a highly dangerous snake.

To sum up, inland Taipan snake is more toxic.