Here are the merits and flaws of each as I see them: Javelins + Free + Quick to Fire lets you position your terradons more aggressively, confident that if they get charged you can Stand & Shoot and have a better chance of taking out one or two of the enemy before they make it into combat. Never a bad thing. Additionally, makes moving and shooting a better option, which adds to the unit's utility. + Decent range lets you use the terradons more effectively as an independent harassing unit if you don't want to get into melee (which I understand they are decent at, but there are always opponents you might want to harass who are better at it). - Standard lousy Strength for Lizardmen shooting. Bolas - Costs points, but... + Not many + Unusually high Strength for Lizardmen shooting. + Flaming Attacks with said decent Strenfth lets you try to tag unit with even a single wound and hope to cause panic and/or eliminate Regeneration. - Tiny range makes placing the unit harder. You need to be within 3'' in order to avoid an additional penalty to your already mediocre BS. Range too short to make standing still and shooting ever a real option. I am totally torn. Javelins seem more versatile - and as I understand it, the main advantage of the terradons is their versatility, being extremely fast and mobile - so they might be a clear choice. But, on the other hand, the bolas bring a lot to the table - another source of flaming attacks, unusually high Strength - and on a platform that just might be fast enough to mitigate the short range. What do you think?